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Proprietary Internet telephony network
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The Skype protocol is a proprietary Internet telephony network used by Skype. The protocol's specifications have not been made publicly available by Skype and official applications using the protocol are closed-source.
The Skype network is not interoperable with most other Voice over IP (VoIP) networks without proper licensing from Skype. Numerous attempts to study or reverse-engineer the protocol have been undertaken to reveal the protocol, investigate security or allow unofficial clients.
On June 20, 2014, Microsoft announced the deprecation of the old Skype protocol. Within several months from this date, in order to continue using Skype services, Skype users had to update to Skype applications released in 2014, and users were not able to log in to older Skype versions (clients).[1][2] No announcement has been made on whether SmartTV and hardware phones with built-in Skype functionality will continue to work without interruptions. The new Skype protocol—Microsoft Notification Protocol 24—promised better offline messaging and better messages synchronization across Skype devices. The deprecation became effective in the second week of August 2014.[3]
^"Making Way for the Next Generation of Skype on Desktop". 20 June 2014.
^Keizer, Gregg (21 June 2014). "Update: Skype to retire recent editions for Windows, Mac; upgrades mandatory".
^Chris Merrimen (15 August 2014). "Skype stops working on older Android phones leaving Linux users in the dark". CNET. Archived from the original on August 16, 2014. Retrieved 2 October 2014.{{cite web}}: CS1 maint: unfit URL (link)
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