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An Internet telephone and video calling service from Skype Technologies S.A.R.L., Luxembourg City, Luxembourg (, a division of Microsoft. Being software based, calls from Skype subscribers originate from their computers or mobile devices, and if the recipient is using a computer or mobile, voice and video calls are free. Access to regular telephones is also available. For outgoing calls, users can dial a landline or cellphone for a low per-minute or monthly charge, and subscribers can obtain a Skype number to receive calls from landlines and cellphones worldwide.

In 2010, Skype introduced its group video calling service that lets five people have a videoconference.

Explosive Growth
Introduced in 2004, within a year, more than a hundred million people downloaded the software. In the fall of 2005, Skype claimed 40 million active users and was acquired by eBay for USD $2.6 billion. By late 2008, an average of 10 million users were using Skype simultaneously. Skype was acquired by private investors a year later with eBay retaining a major equity position. In 2011, Microsoft bought Skype and partnered with Facebook to allow its members to make video calls.

Rather than using standard voice over IP (VoIP) protocols such as SIP and H.323, Skype uses proprietary protocols that incorporate a peer-to-peer architecture. If Skype cannot make a direct connection from one user to the other, it may elicit one of its users who has the Skype application loaded to become a "supernode" and relay the call. Only a fraction of the millions of Skype users become supernodes at any given time. See Skype for Business, supernode and softphone.
References in periodicals archive ?
Dmitry Leskov Excelsior LLC +1 (408) 786 5641 skypein dleskov@excelsior-usa.
SkypeIn is a pay service that costs about $30 to $60 per year, depending on other services subscribed to.
com/> button on their e-commerce site, online support portal, or web banner, as well as expand market presence by adding a local number in any country where global SkypeIn is available.
Skype, SkypeIn, SkypeOut, Skype Me, Skype Certified, Skypecasts, associated logos and the "S" symbol are trademarks of Skype Limited.
It will enable MySpace network users to select Skype's fee-based products such as SkypeOut, SkypeIn, Voicemail and Call forwarding, and will ensure personal privacy settings for users within the MySpace network.
At the service level, Skype offers its SkypeIn and SkypeOut service while at the access network level, it offers the Skype Zones that can be accessed at affordable rates wherever present.
Panasonic said the KX-WP1050 phone uses Wi-Fi access to enable Skype users to make and receive free Skype-to-Skype calls and receive SkypeIn calls and make SkypeOut calls, to and from landlines and mobiles respectively.
SkypeIn allows you to have a regular phone number that friends and family can use to call you no matter where you physically may be.
In addition to the availability of standard SkypeIn, SkypeOut, and Skype Voicemail features, the WM4201 also comes with Wireless Multi-Media (WMM) to improve voice quality and WPA/WPA2-PSK for secure wireless connectivity.
Having sorted the basics out I'm now looking at Sky-peOut and SkypeIn, that is linking my Skype phone to real phones, something that would have been particularly useful for the 45 minute pre-sales call I had to a Canadian mobile last week.
You get charged for additional services such as calling ordinary phones through SkypeOut; there are charges for roaming using SkypeIn.