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2. 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 ...

3. List of SIP software - Wikipedia

   en.wikipedia.org/wiki/List_of_SIP_software

   Creacode SIP Application Server Real-time SIP call controller and IVR product for carrier-class VoIP networks; Dialogic Corporation Powermedia Media Servers, audio and video SIP IVR, media and conferencing servers for Enterprise and Carriers. Dialexia VoIP Softswitches, IP PBX for medium and enterprise organizations, billing servers.

4. Session Initiation Protocol - Wikipedia

   en.wikipedia.org/wiki/Session_Initiation_Protocol

   In November 2000, SIP was accepted as a 3GPP signaling protocol and permanent element of the IP Multimedia Subsystem (IMS) architecture for IP-based streaming multimedia services in cellular networks. In June 2002 the specification was revised in RFC 3261 [4] and various extensions and clarifications have been published since. [5]

5. IP Multimedia Subsystem - Wikipedia

   en.wikipedia.org/wiki/IP_Multimedia_Subsystem

   The IP Multimedia Subsystem or IP Multimedia Core Network Subsystem (IMS) is a standardised architectural framework for delivering IP multimedia services. Historically, mobile phones have provided voice call services over a circuit-switched -style network, rather than strictly over an IP packet-switched network.

6. Multimedia telephony - Wikipedia

   en.wikipedia.org/wiki/Multimedia_Telephony

   The 3GPP/NGN IP Multimedia Subsystem (IMS) multimedia telephony service (MMTel) is a global standard based on the IMS, offering converged, fixed and mobile real-time multimedia communication using the media capabilities such as voice, real-time video, text, file transfer and sharing of pictures, audio and video clips. With MMTel, users have the ...

7. Message Session Relay Protocol - Wikipedia

   en.wikipedia.org/wiki/Message_Session_Relay_Protocol

   An application instantiates the session with the Session Description Protocol (SDP) over Session Initiation Protocol (SIP) or other rendezvous methods. The MSRP protocol is defined in RFC 4975. [1] MSRP messages can also be transmitted by using intermediaries peers, by using the relay extensions defined in RFC 4976. [2]