This page will contain blogs about skype, as they become available.

Skype


Skype (IPA pronunciation: /skaɪp/, rhymes with type) is a proprietary peer-to-peer Internet telephony (VoIP) network, founded by Niklas Zennström and Janus Friis, the creators of KaZaA and competing against established open VoIP protocols like SIP or H.323. The Skype Group is headquartered in Luxembourg with offices also in London and Tallinn. The system has a reputation for working across different types of network connections (including firewalls and NAT) because voice packets are routed by the combined users of the free desktop software application. Skype users can speak to other Skype users for free, call traditional telephone numbers for a fee (SkypeOut), receive calls from traditional phones for a fee (SkypeIn), and receive voicemail messages for a fee.

In September 2005, in a deal generally criticised by many as overpriced [1], eBay acquired the company for $US 2.6 billion in cash and stock, plus an additional 1.5 billion in rewards if goals are met by 2008. [2]

Features

The basic computer-to-computer service allows users to speak, to send instant messages or to send files to one another from their computers via the Internet at no cost. Conferences of up to five users are supported.

SkypeOut

SkypeOut is a paid feature of the Skype Internet telephony service, which allows Skype users to call virtually any non-computer-based landline or mobile telephone in the world.

Unlike international long-distance calls made from conventional telephones, which are traditionally rated according to the relative distance between countries, SkypeOut bills all calls according to the level of telecommunications liberalisation of the destination country, the volume of calls made from and to a given country, and access charges such as those to mobile (cell) phones. This rating method is used due to the fact that calls are rated the same regardless of place of origin.

This way, a SkypeOut user will be billed the same for a call placed to a telephone number in London, whether the user is calling from his/her computer in London itself, or from a different country. The Global Rate which is the one used for many countries, including nearly all First World countries, is currently 1.7 euro cents per minute. Credit, which is necessary to use SkypeOut, is usually purchased via credit card, personal check or money order, or online services such as PayPal or Moneybookers. The current deposit is either €10 or €25, which automatically expires after 180 days of inactivity — a timer is reset after each successful SkypeOut connect. In European Union countries, Luxembourg VAT of 15% is added to the charge, which makes the actual prices closer to €0.02 per minute.

SkypeIn

SkypeIn allows Skype users to receive calls on their computers dialed by regular phone subscribers to regular phone numbers. Beta released on March 10, 2005, SkypeIn permits users to subscribe to numbers in UK, USA, France, Hong Kong, Denmark, Finland, Germany, Sweden, Estonia, Switzerland, Poland and Brazil. (Although France, Germany and Switzerland give SkypeIn numbers only to residents).

Cost is €30 for a twelve-month subscription, or €10 for a three-month subscription. Users can have multiple SkypeIn phone numbers bound to the same account (a separate subscription is required for each). For example, someone who does business in both San Francisco and Helsinki could create a local telephone number in each city, and callers from those locations would pay cheap or free local rates.

Skype Voicemail

Skype Voicemail was released on March 10, 2005. This service allows callers to leave voice-mail messages for Skype users who are not online, on another call or otherwise indisposed. This can be purchased separately and is automatically bundled in with SkypeIn.

Skype Chat

Skype supports group chat with an interface similar to IRC.

Skype Video Calling

Skype 2.0 has a Skype Video Calling feature which has been implemented to enable videoconferencing. This feature is only supported when running Windows XP.

Releases

Skype Version 1.2 for Windows was released in March 23, 2005. Its most significant new feature is the provision of centrally-stored contact lists so that a user's contact information is available from any computer that is connected to Skype (in other previous versions, contact information was stored on the local computer).

On 2006-01-05, version 2.0.0.69 of Skype was released.

Versions now exist for Microsoft Windows (Windows 2000, Windows XP and Windows CE (Pocket PC)), Mac OS X and GNU/Linux. The Linux version runs on FreeBSD through its Linux binary compatibility.

Technology

Each Skype user must have the Skype software running on his/her computer. This software is currently available free of charge and can be downloaded from the company website, but the software is proprietary.

The main difference between Skype and other VoIP clients is that it operates on a peer-to-peer model rather than the more traditional server-client model. The Skype user directory is entirely decentralised and distributed among the nodes in the network, which means the network can scale very easily to large sizes (currently just over forty million users) without a complex and costly centralised infrastructure.

Skype also routes calls through other Skype peers on the network, which allows it to traverse Symmetric NATs and firewalls, unlike most other VoIP programs (The two most common VoIP protocols, SIP and H323 are usually UDP and point-to-point, making NAT traversal problematic; see article). This, however, puts an extra burden on those who connect to the Internet without NAT, as their computers and network bandwidth may be used to route the calls of other users. The selection of intermediary computers is fully automatic, with individual users having no option to disable such use of their resources. This fact is not clearly communicated, however, and seems to contradict the license agreement which would limit Skype's utilisation of the user's "processor and bandwidth [to the] purpose of facilitating the communication between [the user] and other Skype Software users" (section 4.1).

The Skype code is closed source and the protocol is proprietary which has raised suspicion and drawn broad criticism from software developers and the VoIP user communities.

The Skype client's application programming interface (API) exposes the network to software developers. The Skype API allows other programs to use the Skype network to get "white pages" information and manage calls.

The Windows user interface was developed in Pascal using Delphi, while the Linux version is written in C++ with Qt and the Mac OS X version is written in Objective-C with Cocoa. [3]

GIPS iLBC CODEC

iLBC (Internet Low Bit-rate Codec) is a free speech codec suitable for most voice communication over IP. The codec is designed for narrowband speech and results in a payload bit rate of 13.33 kbit/s with an encoding frame length of 30 ms and 15.20 kbit/s with an encoding length of 20 ms. The iLBC codec enables graceful speech quality degradation in the case of lost frames, which occurs in connection with lost or delayed IP packets.

Features

  • Bitrate 13.33 kbit/s (399 bits, packetised in 50 bytes) for the frame size of 30 ms and 15.2 kbit/s (303 bits, packetised in 38 bytes) for the frame size of 20 ms
  • Basic quality higher than G.729A, high robustness to packet loss
  • Computational complexity in a range of G.729A
  • Royalty-free codec

Security

General

Since the Skype code is proprietary and closed source the security of the software cannot be readily established. When run on Microsoft Windows, Skype binds to three ports on the user's computer and directly manipulates Windows XP's built-in firewall to accommodate these network bindings.

Skype's file transfer function does not contain any programmatic interfaces to antivirus products, but Skype claims to have tested its product against antivirus "Shield" products. If the EICAR test file is sent over Skype's file transfer service, every major antivirus product appears to catch the virus and halt its transmission or reception via Skype.

Skype accesses the hard disk several times per minute. This can be verified either by observing the HDD's activity LED or by using a file access monitor such as Filemon. Although those accesses are small, extremely fast and safe in the short term, they can be extremely harmful in the long term. In particular the continuous access pattern does not allow the disk to enter sleep or idle modes while Skype is active, even when offline. This can severely reduce the lifespan of the HDD when Skype is running for a long time. Stronger HDD caching does not seem to improve the situation.

Niklas Zennstrom, co-founder of Skype, has admitted that the current security model would not withstand open-source scrutiny:

Would he make Skype open-source? No - that would make its strong 1024 bit encryption and security vulnerable: "We could do it but only if we re-engineered the way it works and we don't have the time right now."

This would seem to be an admission that Skype relies on security through obscurity.

Confidentiality of Data

Since a Skype connection may be routed through an intermediate peer, 256-bit AES encryption actively encodes the data stream of each call, or file transfer. Skype uses 1536-bit RSA (2048-bit RSA for customers who have purchased any "paid services" such as voicemail) to secure the pairwise negotiation of an AES symmetric session key over an untrusted channel. The proprietary session establishment protocol is efficient and prevents both man-in-the-middle and replay attacks. The Skype server certifies each user's public key at log in.

Integrity/Authenticity of Data

The integrity of the data, i.e. data modified while traveling though peers, even if encrypted, is unknown and undocumented. The mechanism and implementation has been examined in Bernson's report - referenced below.

Authenticity of user identity

Skype provides an uncontrolled registration system for users: registration requires no proof of the identity of the user at all. This works two ways: you can use the system without revealing your identity to other users of the system, but on the other hand you have no guarantees that the person you communicate with is the one he says he is. The down side of this is that it is easy to use the identity of a trusted person and trick a user to reveal information or execute a program sent to him.

Prank program

In September 2005 a prank program was launched online. This unauthorised patch allowed a Skype user to masquerade as another user. The technique was for the joker to put up an attractive profile with a girl’s name and picture, and put that profile into "Skype me" mode. Within minutes generally another user would invariably try calling/chatting. The patch running the whole time would then partner up another call to the first caller, and send messages from the first person to the second, and vice versa. This way both people thought they were talking to a middle user whose profile of course was entirely fake. The patch only supported text messaging.

History

  • April 23, 2003: Skype.com and Skype.net domain names registered
  • August 29, 2003: First public beta version released
  • June 15, 2004: Beta release of version 0.98.0.28 with first support for SkypeOut. Credits by voucher only.
  • June 27, 2004: SkypeOut credits first available for purchase on Skype website.
  • July 27, 2004: Release of Version 1.0 for Windows.
  • October 20, 2004: First time 1 million Skype users are online at once.
  • February 14, 2005: First reached 2 million online.
  • March 10, 2005: SkypeIn Public Beta starts.
  • March 11, 2005: Skype press release reports 1 million Skype-out users and 29 million registered users.
  • March 11, 2005: Software has been downloaded 84 million times and 5.98 billion talk minutes served.
  • April 15, 2005: Downloaded more than 100 million times.
  • May 18, 2005: Three million online at once.
  • June 19, 2005: Ten billion minutes of voice conversation served.
  • August 31, 2005: Skype launches the new "1.4 beta" containing improved sound and call forwarding.
  • September 2005: SkypeOut Banned in South China.
  • September 12, 2005: eBay announces purchase of Skype (see GAMEY)
  • October 18, 2005: eBay completes purchase of Skype (announcement)
  • December 1, 2005: Skype launches Skype 2.0 in beta for Windows, a major new feature is videotelephony to other Skype users [4]
  • January 6, 2006: Skype 2.0 general release is announced.
  • January 19, 2006: Skype 2.0 official release.
  • February 3, 2006: Skype becomes fully integrated with popular online message board Bebo allowing registered users to call and IM eachother directly from their profiles.

Skype business ecology

Distribution partners

Skype has partnered with online web properties including Tom.com, PcHomeOnline, Daum, Livedoor, Bebo and Onet and hardware manufacturers including Plantronics, Logitech, Motorola, VTech, RTX, Siemens and Linksys.

Third Party Software products

Festoon is a Skype add-on product for Windows computers (2000 or XP with Internet Explorer 5+) that "adds video and sharing to Skype. Built on top of the Skype messaging platform, Festoon enables Skype users to securely conduct video calls in groups from 2 to 200 and share applications, spreadsheets, presentations, or photos with others on a call" (from official website).

HansaWorld 4.3 attempts to allow users the seamless integration of Skype with ERP and CRM in business.

Morgle is a comprehensive world wide online business directory for Skype users. Morgle provides searchable links to Skype user web sites, provides each entry with a spam free business enquiry form, and allows users to display product or company pictures with a searchable advertising message. Skype Id's are automatically displayed on search results allowing enquirers to speak to the business directly off the web page or send an email enquiry to the business.

WizzTonesis a new and easy-to-use software product that works in conjunction with Skype. WizzTones provides Skype users a simple and convenient way to create, manage and use multiple ringtones for a compelling, personalized communication experience. By downloading WizzTones, Skype users may create customized ring tones and assign every individual on their Contacts list a distinct and different sound, giving Skype users the freedom to walk away from their computers but still be available to identify and take an important call, or avoid an unwanted one. Visit the WizzTones Website.

Usage

SR Consulting surveyed 4 million Skype user profiles in October 2005. They produced some demographic information reported by Mathaba.net and Skype Journal. Some findings:

  • Average age: 29.7 years old.
  • About 46% of Skypers are in Europe, but Brazil and China have the most Skype users of any country, each with 8.1% of the Skype population.
  • Gender information is inconclusive so far. More than half of all users declined to state their sex.

Criticisms

As of July 2005, the line quality varies from excellent (comparable to traditional telephony) to barely usable. The main drawbacks are:

  1. time lag, often around 0.5 seconds, but occasionally up to two or three seconds, apparently caused by distant remote routing or the low bandwidth of either or both parties;
  2. dropout and fizz;
  3. reliance on a network (the Internet) over which there is little or no control of quality of service (QoS). This is the main contributor to its poor performance.

These problems can be minimised by using the service when the network traffic on the Internet is minimal between the ingress and egress to the network. This is however sometimes impossible. The issues are common for all VoIP applications; in fact in restricted networks many of them don't work at all due to firewalls and NAT routers in large private networks from which users attempt to use Skype; while Skype, and other VoIP services are at least able to connect through properly configured third party relay hosts. There are open standards protocols such as SIP and STUN which do the same thing.

A broader criticism leveled at Skype is over its use of a proprietary protocol, instead of an open standard like H.323 or SIP, making it impossible for other providers to interact with the Skype network. There are of course clear business and technical reasons for this, such as protecting the SkypeOut revenue stream.

A design limitation of Skype is, if given access to an unrestricted network connection, Skype clients can become supernodes. These supernodes hold together the peer-peer network and provide data routing for those behind restrictive firewalls. Unfortunately, these supernodes can generate a significant amount of bandwidth—saturating a high speed, 100 Mbit/s connection is not unheard of. For this reason some network providers, such as universities, have banned Skype.

User count and acceptance is often no indicator as to the quality of a service. There may be superior services available whose number of users look poor in comparison with Skype as Skype has been more successful in marketing its service than other pre-existing VoIP telephony services such as VocalTec (established in 1995). The number of users quoted as Skype users are taken from the number of people that have downloaded the software and not necessarily used the service to make voice calls.

SkypeOut rates do not always keep up with the general downward trend in rates charged by conventional telephone companies. For example, in the United Kingdom, the trend is for companies to charge a fixed price per call, for example 3p to 6p for an inland call of unlimited or long duration. With SkypeOut, calls are still charged at a per-minute rate as opposed to a per-call rate, meaning that SkypeOut can be comparatively expensive for inland calls.

The Linux community criticized Skype for not doing any further development for Linux due to the fact that the last release was in October, 2005. The only proof to counteract the criticism is that Skype fixed a Mandriva installation problem on January 6th, 2006. (Release # 1.2.0.21)

Prohibitions and warnings

Legal and other barriers have been erected by companies, government regulators, and school systems. Reasons given include perceived threats to an economic interest, to national or enterprise security, to system reliability.

China 2005

SkypeOut was recently blocked in some regions of mainland China (notably Shenzhen) by the operator China Telecom for undisclosed reasons, believed to relate to SkypeOut's ability to take lucrative international and long distance business away from the People's Republic of China's state controlled telecoms companies.

France 2005

In September 2005, the French Ministry of Research, acting on advice from the general secretariat of national defense, disapproved the use of Skype in public research and higher education; some services are interpreting this decision as an outright ban. The exact reasons for the decision were not given, but computer security professionals point out that:

  • Skype is a proprietary software program using undocumented protocols, and laws prohibit reverse-engineering it;
  • Skype implements some kind of "peer-to-peer" network over client machines, with clients on fast connections becoming major exchange points; since research centers typically have very high speed connections, machines running Skype in those centers may generate very high traffic; some networks were reportedly nearly saturated by Skype traffic;
  • the information flow implemented by Skype is unknown; though encryption is used, it is unknown where traffic goes.

As such, Skype is considered a security hazard for research networks, in which there may be significant intellectual property.


Skype vs traditional phone companies

Phone companies have traditionally charged users a large amount, often proportional to the distance, for long distance calls. Skype, arguably the first major VoIP software, allowed people to talk over the Internet for free. This led to many home users with broadband capability to switch to Skype for placing their calls over the Internet. Skype being secure and encrypted end-to-end, has also attracted large corporations who are beginning to switch from their traditional phone companies for their internal calls. Phone companies were all of a sudden out of favor in the markets which patronized Skype.[citation needed]


Compatible products

Netgear newly anounced a skype preloaded phone which does not have to be connected to a computer to use Skype; it uses a WiFi connection instead. It has been announced that Motorola will release a similar product (CN620 WiFi cell phone). The aceton skyfon WM1185-T cell phone is also preinstalled with Skype. i-mate PDA2 also comes with a preinstalled Skype.


This page about skype includes information from a Wikipedia article.
Additional articles about skype
News stories about skype
External links for skype
Videos for skype
Wikis about skype
Discussion Groups about skype
Blogs about skype
Images of skype

i-mate PDA2 also comes with a preinstalled Skype. Link to forum. The aceton skyfon WM1185-T cell phone is also preinstalled with Skype. It has many different topics mainly focussing on cricket and Stick Cricket. It has been announced that Motorola will release a similar product (CN620 WiFi cell phone). There is also a Stick Cricket Forum. Netgear newly anounced a skype preloaded phone which does not have to be connected to a computer to use Skype; it uses a WiFi connection instead. Source: Stick Cricket: About.


. Email the OBO and you might get the chance to have your word in the commentary! (SCM). Phone companies were all of a sudden out of favor in the markets which patronized Skype.[citation needed]. Now, in most games you can sit and watch the game on Stick Cricket, while reading some funny over by over commentary by some Cricket-o-Holics out there. Skype being secure and encrypted end-to-end, has also attracted large corporations who are beginning to switch from their traditional phone companies for their internal calls. Go to The Stickcricket website for more details. This led to many home users with broadband capability to switch to Skype for placing their calls over the Internet. Stick Cricket has teamed up with Ian Botham, a cricketing legend to indroduce Ian Botham's Stick Mobile on mobile phones.

Skype, arguably the first major VoIP software, allowed people to talk over the Internet for free. These are the Head2Head standings seen here as of 9 January 2006. Phone companies have traditionally charged users a large amount, often proportional to the distance, for long distance calls. Also, to play as any country in world domination, you simply do as follows:.
. There are certain hidden features in the game, namely "Easter Eggs". As such, Skype is considered a security hazard for research networks, in which there may be significant intellectual property. This is because of impatient and inexperienced players trying to make a shot too early, forcing the batsman to mistime a shot, often resulting in the fall of a wicket.

The exact reasons for the decision were not given, but computer security professionals point out that:. Each has their own weaknesses and strengths, however, many people have found fast bowling to be the easiest to face while spin considered to be the hardest, especially the leg spinners. In September 2005, the French Ministry of Research, acting on advice from the general secretariat of national defense, disapproved the use of Skype in public research and higher education; some services are interpreting this decision as an outright ban. There are different types of bowlers:. SkypeOut was recently blocked in some regions of mainland China (notably Shenzhen) by the operator China Telecom for undisclosed reasons, believed to relate to SkypeOut's ability to take lucrative international and long distance business away from the People's Republic of China's state controlled telecoms companies. Risk of being out LBW, if the delivery is not a bouncer.
Left, A - Pull and hook, if full an on-drive, but often gets caught: Particularly effective against all bowlers.
Right, D - Cut & Cover Drive: Effective against fast, outswing bowlers but you can be risked of getting caught out at cover. Reasons given include perceived threats to an economic interest, to national or enterprise security, to system reliability. Up, W - Forward drive and defend: Not effective against leg spiners and off spinners.
Down, S - Duck: (especially from bouncers).

Legal and other barriers have been erected by companies, government regulators, and school systems. You can also choose what type of game you want to play. (Release # 1.2.0.21). It allows a user to select a national cricket team or a specialized team selected by the winner of the entire World Domination mode. The only proof to counteract the criticism is that Skype fixed a Mandriva installation problem on January 6th, 2006. When Stick Cricket loads, a welcome screenshot comes up. The Linux community criticized Skype for not doing any further development for Linux due to the fact that the last release was in October, 2005. The basic objective is to scores as many runs as possible, by the following:.

With SkypeOut, calls are still charged at a per-minute rate as opposed to a per-call rate, meaning that SkypeOut can be comparatively expensive for inland calls. Although it is always viewed from this angle it is possible to bowl, but this feature is currently only included in the 2 player version of the game. For example, in the United Kingdom, the trend is for companies to charge a fixed price per call, for example 3p to 6p for an inland call of unlimited or long duration. Stick Cricket is viewed from the facing batsman's end. SkypeOut rates do not always keep up with the general downward trend in rates charged by conventional telephone companies. By popular demand, two players can now play on the one keyboard, and Tournament mode has been added. The number of users quoted as Skype users are taken from the number of people that have downloaded the software and not necessarily used the service to make voice calls. It also added new features around the site, such as Office Leagues, where there are some general leagues, and you can set up your own as well.

There may be superior services available whose number of users look poor in comparison with Skype as Skype has been more successful in marketing its service than other pre-existing VoIP telephony services such as VocalTec (established in 1995). In general Version 3.2 added new graphics, including new balls where you can see the seam, and a new stadium. User count and acceptance is often no indicator as to the quality of a service. The current version of the game, 3.2 was released on 21st July, and added new graphics in the main, and a new Head2Head Ashes game for the duration of the Ashes, which features a different stadium - Lord's, a different ball (red with seam) and different bowling actions to version 3.1. For this reason some network providers, such as universities, have banned Skype. Also updated were the teams, so they had the most recent players in, and the rankings in accordance with the official ICC One-Day International ratings. Unfortunately, these supernodes can generate a significant amount of bandwidth—saturating a high speed, 100 Mbit/s connection is not unheard of. You play as a Stick All-Star Team, which contains some of the best players in cricket's history.

These supernodes hold together the peer-peer network and provide data routing for those behind restrictive firewalls. Version 3.1 added the world domination version, where you play the world's 8 best teams, and receive a password for each of the teams a player beats. A design limitation of Skype is, if given access to an unrestricted network connection, Skype clients can become supernodes. There have been minor updates since then, such as the inclusion of 3 different modes: the Knockout Tournament, based on the ICC Champions Trophy format; the all-star slog where you try to get as many runs as you can in 10 Overs; and the Practice Mode, where you could practice 10 overs against a certain type of bowling. There are of course clear business and technical reasons for this, such as protecting the SkypeOut revenue stream. It also featured the ability to play with 12 teams, though the USA were replaced with a fictional team. A broader criticism leveled at Skype is over its use of a proprietary protocol, instead of an open standard like H.323 or SIP, making it impossible for other providers to interact with the Skype network. Version 3 moved Stick Cricket to its current home, where it has its own site.

There are open standards protocols such as SIP and STUN which do the same thing. This was the basis of the stick cricket world. The issues are common for all VoIP applications; in fact in restricted networks many of them don't work at all due to firewalls and NAT routers in large private networks from which users attempt to use Skype; while Skype, and other VoIP services are at least able to connect through properly configured third party relay hosts. Another version, featuring a fictional Australian team, was also playable online. This is however sometimes impossible. There was the official version, which was on Mousebreaker, featuring 7 levels which you could play through as the England team. These problems can be minimised by using the service when the network traffic on the Internet is minimal between the ingress and egress to the network. Version 2 appeared in 2 guises.

The main drawbacks are:. This version, which built the foundation for version 2 and was the first appearance of Stick Cricket ever, is extremely hard to find on the internet. As of July 2005, the line quality varies from excellent (comparable to traditional telephony) to barely usable. Other websites have a modified (usually outdated) version of Stick Cricket, though some are now offline, for those feeling nostalgic. Some findings:. However, the batsmen were really sticks before the Stick Cricket game was moved from the servers of Cann Creative to its own website. They produced some demographic information reported by Mathaba.net and Skype Journal. Current versions of Stick Cricket have human batsmen.

SR Consulting surveyed 4 million Skype user profiles in October 2005. The current version of Stick Cricket is version 3.3 [1]. Visit the WizzTones Website. . By downloading WizzTones, Skype users may create customized ring tones and assign every individual on their Contacts list a distinct and different sound, giving Skype users the freedom to walk away from their computers but still be available to identify and take an important call, or avoid an unwanted one. The average size of the game is around 500 kilobytes. WizzTones provides Skype users a simple and convenient way to create, manage and use multiple ringtones for a compelling, personalized communication experience. Stick Cricket is a popular game, being one of the most visited cricket websites with over 35,000 visits a day.

WizzTonesis a new and easy-to-use software product that works in conjunction with Skype. It runs from any web browser which has the Macromedia flash player plug-in and Internet access. Skype Id's are automatically displayed on search results allowing enquirers to speak to the business directly off the web page or send an email enquiry to the business. The game, was developed by Cann Creative, a company from Sydney, Australia. Morgle provides searchable links to Skype user web sites, provides each entry with a spam free business enquiry form, and allows users to display product or company pictures with a searchable advertising message. Stick Cricket is a Macromedia flash cricket game website. Morgle is a comprehensive world wide online business directory for Skype users. Stick Cricket.com [2] Accessed 19/02/2005.

HansaWorld 4.3 attempts to allow users the seamless integration of Skype with ERP and CRM in business. 77695 - articles in the online forum. Built on top of the Skype messaging platform, Festoon enables Skype users to securely conduct video calls in groups from 2 to 200 and share applications, spreadsheets, presentations, or photos with others on a call" (from official website). 17.6 minutes - is how long, on average, a visit to the site lasts. Festoon is a Skype add-on product for Windows computers (2000 or XP with Internet Explorer 5+) that "adds video and sharing to Skype. The MCG at full capacity would only just fit in the number of players Stick Cricket has in 1 day. Skype has partnered with online web properties including Tom.com, PcHomeOnline, Daum, Livedoor, Bebo and Onet and hardware manufacturers including Plantronics, Logitech, Motorola, VTech, RTX, Siemens and Linksys. Friday - is the most popular day to play.

The patch only supported text messaging. 513 - players who have won the World Domination. This way both people thought they were talking to a middle user whose profile of course was entirely fake. ½ million - registered Stick Cricketers . The patch running the whole time would then partner up another call to the first caller, and send messages from the first person to the second, and vice versa. 2½ million - visitors to the site every month. Within minutes generally another user would invariably try calling/chatting. Click play.

The technique was for the joker to put up an attractive profile with a girl’s name and picture, and put that profile into "Skype me" mode. Click on "How To Play" and then back. This unauthorised patch allowed a Skype user to masquerade as another user. Click on to the team you want. In September 2005 a prank program was launched online. Click on practice mode. The down side of this is that it is easy to use the identity of a trusted person and trick a user to reveal information or execute a program sent to him. BOUNCERS - To play 10 overs with every ball being bowled a bouncer type 'bouncers' into the world domination password box.

This works two ways: you can use the system without revealing your identity to other users of the system, but on the other hand you have no guarantees that the person you communicate with is the one he says he is. RANDOM - To play against bowlers that can bowl all kinds of deliveries in the same over for 10 overs similar to the All-Star Slog, type "random" in the World Domination box. Skype provides an uncontrolled registration system for users: registration requires no proof of the identity of the user at all. SWING - To play against bowlers that can bowl both kinds of swing in the same over for 10 overs similar to the All-Star Slog, type "swing" in the World Domination box. The mechanism and implementation has been examined in Bernson's report - referenced below. SPIN - To play against bowlers that can bowl both kinds of spin in the same over for 10 overs similar to the All-Star Slog, type "spin" in the World Domination box. data modified while traveling though peers, even if encrypted, is unknown and undocumented. This can be activated by clicking on the commentator's nose (Richie Benaud).

The integrity of the data, i.e. Domestic teams - Play against some of the best domestic teams in the world, such as New South Wales, Mumbai and so forth. The Skype server certifies each user's public key at log in. If you choose to play the Stick Cricket Tournament in 1987 mode, the USA team is comprised of characters from the Police Academy movies!. The proprietary session establishment protocol is efficient and prevents both man-in-the-middle and replay attacks. 1987 teams - Play against the 1987 team, this can be activated by clicking on the duck that appears on screen when you are out for a duck. Skype uses 1536-bit RSA (2048-bit RSA for customers who have purchased any "paid services" such as voicemail) to secure the pairwise negotiation of an AES symmetric session key over an untrusted channel. Leg spin - Shane Warne, Abdul Qadir, Anil Kumble and so forth.

Since a Skype connection may be routed through an intermediate peer, 256-bit AES encryption actively encodes the data stream of each call, or file transfer. Slow Orthordox/Off spin - Muttiah Muralitharan and so forth. This would seem to be an admission that Skype relies on security through obscurity. Medium pace - Scott Styris and so forth. Would he make Skype open-source? No - that would make its strong 1024 bit encryption and security vulnerable: "We could do it but only if we re-engineered the way it works and we don't have the time right now.". Outswing bowlers - Shoaib Akhtar, Chaminda Vaas and so forth. Niklas Zennstrom, co-founder of Skype, has admitted that the current security model would not withstand open-source scrutiny:. Inswing bowlers - Brett Lee, Makhaya Ntini and so forth.

Stronger HDD caching does not seem to improve the situation. Fast - Shaun Pollock and so forth. This can severely reduce the lifespan of the HDD when Skype is running for a long time. Scores cannot be saved in practice mode. In particular the continuous access pattern does not allow the disk to enter sleep or idle modes while Skype is active, even when offline. Practice - Choose from a type of bowler and practice, as the name suggests. Although those accesses are small, extremely fast and safe in the short term, they can be extremely harmful in the long term. World Domination - Score runs to beat a national teams total within 20 overs to gain passwords and, eventually go in to the draw to make your own team up if won.

This can be verified either by observing the HDD's activity LED or by using a file access monitor such as Filemon. Slog - Score as many runs as possible within 10 overs against a selected team (an XI)or an World Domination made by one of the players. Skype accesses the hard disk several times per minute. The tournament mode is currently based on the ICC Champions Trophy. If the EICAR test file is sent over Skype's file transfer service, every major antivirus product appears to catch the virus and halt its transmission or reception via Skype. Tournament - Score runs to beat the a national teams total to progress to the next time and beat the World Champions, within 10 overs (60 deliveries). Skype's file transfer function does not contain any programmatic interfaces to antivirus products, but Skype claims to have tested its product against antivirus "Shield" products.

When run on Microsoft Windows, Skype binds to three ports on the user's computer and directly manipulates Windows XP's built-in firewall to accommodate these network bindings. Since the Skype code is proprietary and closed source the security of the software cannot be readily established. The iLBC codec enables graceful speech quality degradation in the case of lost frames, which occurs in connection with lost or delayed IP packets. The codec is designed for narrowband speech and results in a payload bit rate of 13.33 kbit/s with an encoding frame length of 30 ms and 15.20 kbit/s with an encoding length of 20 ms.

iLBC (Internet Low Bit-rate Codec) is a free speech codec suitable for most voice communication over IP. [3]. The Windows user interface was developed in Pascal using Delphi, while the Linux version is written in C++ with Qt and the Mac OS X version is written in Objective-C with Cocoa. The Skype API allows other programs to use the Skype network to get "white pages" information and manage calls.

The Skype client's application programming interface (API) exposes the network to software developers. The Skype code is closed source and the protocol is proprietary which has raised suspicion and drawn broad criticism from software developers and the VoIP user communities. This fact is not clearly communicated, however, and seems to contradict the license agreement which would limit Skype's utilisation of the user's "processor and bandwidth [to the] purpose of facilitating the communication between [the user] and other Skype Software users" (section 4.1). The selection of intermediary computers is fully automatic, with individual users having no option to disable such use of their resources.

This, however, puts an extra burden on those who connect to the Internet without NAT, as their computers and network bandwidth may be used to route the calls of other users. Skype also routes calls through other Skype peers on the network, which allows it to traverse Symmetric NATs and firewalls, unlike most other VoIP programs (The two most common VoIP protocols, SIP and H323 are usually UDP and point-to-point, making NAT traversal problematic; see article). The Skype user directory is entirely decentralised and distributed among the nodes in the network, which means the network can scale very easily to large sizes (currently just over forty million users) without a complex and costly centralised infrastructure. The main difference between Skype and other VoIP clients is that it operates on a peer-to-peer model rather than the more traditional server-client model.

This software is currently available free of charge and can be downloaded from the company website, but the software is proprietary. Each Skype user must have the Skype software running on his/her computer. The Linux version runs on FreeBSD through its Linux binary compatibility. Versions now exist for Microsoft Windows (Windows 2000, Windows XP and Windows CE (Pocket PC)), Mac OS X and GNU/Linux.

On 2006-01-05, version 2.0.0.69 of Skype was released. Its most significant new feature is the provision of centrally-stored contact lists so that a user's contact information is available from any computer that is connected to Skype (in other previous versions, contact information was stored on the local computer). Skype Version 1.2 for Windows was released in March 23, 2005. This feature is only supported when running Windows XP.

Skype 2.0 has a Skype Video Calling feature which has been implemented to enable videoconferencing. Skype supports group chat with an interface similar to IRC. This can be purchased separately and is automatically bundled in with SkypeIn. This service allows callers to leave voice-mail messages for Skype users who are not online, on another call or otherwise indisposed.

Skype Voicemail was released on March 10, 2005. For example, someone who does business in both San Francisco and Helsinki could create a local telephone number in each city, and callers from those locations would pay cheap or free local rates. Users can have multiple SkypeIn phone numbers bound to the same account (a separate subscription is required for each). Cost is €30 for a twelve-month subscription, or €10 for a three-month subscription.

(Although France, Germany and Switzerland give SkypeIn numbers only to residents). Beta released on March 10, 2005, SkypeIn permits users to subscribe to numbers in UK, USA, France, Hong Kong, Denmark, Finland, Germany, Sweden, Estonia, Switzerland, Poland and Brazil. SkypeIn allows Skype users to receive calls on their computers dialed by regular phone subscribers to regular phone numbers. In European Union countries, Luxembourg VAT of 15% is added to the charge, which makes the actual prices closer to €0.02 per minute.

The current deposit is either €10 or €25, which automatically expires after 180 days of inactivity — a timer is reset after each successful SkypeOut connect. Credit, which is necessary to use SkypeOut, is usually purchased via credit card, personal check or money order, or online services such as PayPal or Moneybookers. The Global Rate which is the one used for many countries, including nearly all First World countries, is currently 1.7 euro cents per minute. This way, a SkypeOut user will be billed the same for a call placed to a telephone number in London, whether the user is calling from his/her computer in London itself, or from a different country.

This rating method is used due to the fact that calls are rated the same regardless of place of origin. Unlike international long-distance calls made from conventional telephones, which are traditionally rated according to the relative distance between countries, SkypeOut bills all calls according to the level of telecommunications liberalisation of the destination country, the volume of calls made from and to a given country, and access charges such as those to mobile (cell) phones. SkypeOut is a paid feature of the Skype Internet telephony service, which allows Skype users to call virtually any non-computer-based landline or mobile telephone in the world. Conferences of up to five users are supported.

The basic computer-to-computer service allows users to speak, to send instant messages or to send files to one another from their computers via the Internet at no cost. . [2]. In September 2005, in a deal generally criticised by many as overpriced [1], eBay acquired the company for $US 2.6 billion in cash and stock, plus an additional 1.5 billion in rewards if goals are met by 2008.

Skype users can speak to other Skype users for free, call traditional telephone numbers for a fee (SkypeOut), receive calls from traditional phones for a fee (SkypeIn), and receive voicemail messages for a fee. The system has a reputation for working across different types of network connections (including firewalls and NAT) because voice packets are routed by the combined users of the free desktop software application. The Skype Group is headquartered in Luxembourg with offices also in London and Tallinn. Skype (IPA pronunciation: /skaɪp/, rhymes with type) is a proprietary peer-to-peer Internet telephony (VoIP) network, founded by Niklas Zennström and Janus Friis, the creators of KaZaA and competing against established open VoIP protocols like SIP or H.323.


. the information flow implemented by Skype is unknown; though encryption is used, it is unknown where traffic goes. Skype implements some kind of "peer-to-peer" network over client machines, with clients on fast connections becoming major exchange points; since research centers typically have very high speed connections, machines running Skype in those centers may generate very high traffic; some networks were reportedly nearly saturated by Skype traffic;. Skype is a proprietary software program using undocumented protocols, and laws prohibit reverse-engineering it;.

This is the main contributor to its poor performance. reliance on a network (the Internet) over which there is little or no control of quality of service (QoS). dropout and fizz;. time lag, often around 0.5 seconds, but occasionally up to two or three seconds, apparently caused by distant remote routing or the low bandwidth of either or both parties;.

More than half of all users declined to state their sex. Gender information is inconclusive so far. About 46% of Skypers are in Europe, but Brazil and China have the most Skype users of any country, each with 8.1% of the Skype population. Average age: 29.7 years old.

February 3, 2006: Skype becomes fully integrated with popular online message board Bebo allowing registered users to call and IM eachother directly from their profiles. January 19, 2006: Skype 2.0 official release. January 6, 2006: Skype 2.0 general release is announced. December 1, 2005: Skype launches Skype 2.0 in beta for Windows, a major new feature is videotelephony to other Skype users [4].

October 18, 2005: eBay completes purchase of Skype (announcement). September 12, 2005: eBay announces purchase of Skype (see GAMEY). September 2005: SkypeOut Banned in South China. August 31, 2005: Skype launches the new "1.4 beta" containing improved sound and call forwarding.

June 19, 2005: Ten billion minutes of voice conversation served. May 18, 2005: Three million online at once. April 15, 2005: Downloaded more than 100 million times. March 11, 2005: Software has been downloaded 84 million times and 5.98 billion talk minutes served.

March 11, 2005: Skype press release reports 1 million Skype-out users and 29 million registered users. March 10, 2005: SkypeIn Public Beta starts. February 14, 2005: First reached 2 million online. October 20, 2004: First time 1 million Skype users are online at once.

July 27, 2004: Release of Version 1.0 for Windows. June 27, 2004: SkypeOut credits first available for purchase on Skype website. Credits by voucher only. June 15, 2004: Beta release of version 0.98.0.28 with first support for SkypeOut.

August 29, 2003: First public beta version released. April 23, 2003: Skype.com and Skype.net domain names registered. Royalty-free codec. Computational complexity in a range of G.729A.

Basic quality higher than G.729A, high robustness to packet loss. Bitrate 13.33 kbit/s (399 bits, packetised in 50 bytes) for the frame size of 30 ms and 15.2 kbit/s (303 bits, packetised in 38 bytes) for the frame size of 20 ms.