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2. List of SIP software - Wikipedia

   en.wikipedia.org/wiki/List_of_SIP_software

   ShoreTel IP phone systems with unified communications and contact center built in Snom One free/blue/yellow (Snom acquired and renamed pbxnsip) (SIP) Speedflow Communications VoIP class 4/5 softswitches with integrated billing, transcoding, SIP-H.323 converter.

3. VoIP phone - Wikipedia

   en.wikipedia.org/wiki/VoIP_phone

   STUN is used in some of the sip phones to enable the SIP/RTP packets to cross boundaries of two different IP networks. A packet becomes unroutable between two sip elements if one of the networks uses private IP address range and other is in public IP address range. Stun is a mechanism to enable this border traversal.

4. 3CX - Wikipedia

   en.wikipedia.org/wiki/3CX

   3CX produces a telephone system under the same name. The system consists of a number of software-based [13] components. It can be accessed via a Web Client, PWA, Desktop App, Management & Admin consoles, softphone for Windows, and smartphone clients for iOS and Android. 3CX can be used with either SIP phones or the clients, or a combination of ...

5. snom - Wikipedia

   en.wikipedia.org/wiki/Snom

   The snom 100 VoIP desk telephone was one of the first commercial voice-over-IP telephones in the telecommunication sector. [ 1 ] [ 9 ] The phone was initially based on the H.323 protocol, but was equipped with support for the Session Initiation Protocol the following year, as SIP matured technologically, and gained international recognition in ...

6. Session Initiation Protocol - Wikipedia

   en.wikipedia.org/wiki/Session_Initiation_Protocol

   A SIP phone is an IP phone that implements client and server functions of a SIP user agent and provides the traditional call functions of a telephone, such as dial, answer, reject, call hold, and call transfer. [16] [17] SIP phones may be implemented as a hardware device or as a softphone.

7. SIP extensions for the IP Multimedia Subsystem - Wikipedia

   en.wikipedia.org/wiki/SIP_extensions_for_the_IP...

   These two extensions allow users to specify their preferences about the service the IMS provides. With the caller preferences extension, [8] the calling party is able to indicate the kind of user agent they want to reach (e.g. whether it is fixed or mobile, a voicemail or a human, personal or for business, which services it is capable to provide, or which methods it supports) and how to search ...