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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 .
RFCOMM provides a simple reliable data stream to the user, similar to TCP. It is used directly by many telephony related profiles as a carrier for AT commands, as well as being a transport layer for OBEX over Bluetooth. Many Bluetooth applications use RFCOMM because of its widespread support and publicly available API on most operating systems.
Although it is commonly used in the context of telecommunications, it can apply to any system that provides a service (e.g. VOIP Telephone, Internet Protocol TV, Internet Service, or SaaS). [1] Although the TM Forum (TMF) is working on defining specifications in this area, there is no standard definition of SDP in industry and different players ...
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).
This facilitates centralized gateway administration and provides scalable IP telephony solutions. The distributed system is composed of at least one call agent and one or usually, multiple media gateways, which performs the conversion of media signals between circuit-switched and packet-switched networks, and at least one signaling gateway (SG ...
These systems often also implement Headset (HSP) or Hands-Free (HFP) profiles for telephone calls, which may be used separately. Each A2DP service, of possibly many, is designed to uni-directionally transfer an audio stream in up to 2 channel stereo, either to or from the Bluetooth host. [2] This profile relies on AVDTP and GAVDP.
No. of channels Clock rate (Hz) [note 1] Frame size (byte) Default packet interval (ms) Description References 0 PCMU audio 1 8000 any 20 ITU-T G.711 PCM μ-Law audio 64 kbit/s RFC 3551 1 reserved (previously FS-1016 CELP) audio 1 8000 reserved, previously FS-1016 CELP audio 4.8 kbit/s RFC 3551, previously RFC 1890 2
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 ...