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The Session Description Protocol (SDP) is a format for describing multimedia communication sessions for the purposes of announcement and invitation. [1] Its predominant use is in support of streaming media applications, such as voice over IP (VoIP) and video conferencing .
As SIP can apply a mixture of these Internet and Telephone system identifiers in the call process, it follows that the SDP must tightly couple its SIP processing with the DHCP system and DNS, the HSS mobile database, the User authorization system, the presence event system, the user's address book, telephone call feature processing and the ...
A service control point (SCP) is a standard component of the Intelligent Network (IN) telephone system which is used to control the service. [1] Standard SCPs in the telecom industry today are deployed using SS7, SIGTRAN or SIP technologies. The SCP queries the service data point (SDP) which holds the actual database and directory. SCP, using ...
ITU-T G.711.1 A-law RFC 5391 dynamic PCMU-WB audio 1 16000 5 ITU-T G.711.1 μ-law RFC 5391 dynamic G718 audio 32000 (placeholder) 20 ITU-T G.718: draft-ietf-payload-rtp-g718: dynamic G719 audio (various) 48000 20 ITU-T G.719: RFC 5404 dynamic G7221 audio 16000, 32000 20 ITU-T G.722.1 and G.722.1 Annex C RFC 5577 dynamic G726-16 audio 1 8000 any 20
SIP-based telephony networks often implement call processing features of Signaling System 7 (SS7), for which special SIP protocol extensions exist, although the two protocols themselves are very different. SS7 is a centralized protocol, characterized by a complex central network architecture and dumb endpoints (traditional telephone handsets).
G.711 is a narrowband audio codec originally designed for use in telephony that provides toll-quality audio at 64 kbit/s. It is an ITU-T standard (Recommendation) for audio encoding, titled Pulse code modulation (PCM) of voice frequencies released for use in 1972.
Call originator - (or calling party, caller or A-party) a person or device that initiates a telephone call by dialling a telephone number. Call waiting - a system that notifies a caller of another incoming telephone call by sounding a sound in the earpiece. Called party - (or callee or B-party) Caller; Calling party; Conference call (multi ...
Real-time text encoding is identified by using the SDP media definition 'm=text'. The 3GPP IMS defines the features of SDP that ToIP uses in 3GPP TS 26.114 v7.4.0 A5 See IETF RFC 5194 "Framework for real-time text over IP using the Session Initiation Protocol (SIP)" and IETF RFC 4504 "SIP Telephony Device Requirements and Configuration" Section ...