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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
SAP typically uses Session Description Protocol (SDP) as the format for Real-time Transport Protocol (RTP) session descriptions. Announcement data is sent using IP multicast and the User Datagram Protocol (UDP). Under SAP, senders periodically transmit SDP descriptions to a well-known multicast address and port number (9875). [1]
The Communications Assistance for Law Enforcement Act (CALEA), also known as the "Digital Telephony Act," is a United States wiretapping law passed in 1994, during the presidency of Bill Clinton (Pub. L. No. 103-414, 108 Stat. 4279, codified at 47 USC 1001–1010).
A common problem with secure media is that the key exchange might not be finished when the first media packet arrives. In order to avoid initial clicks, those packets must be dropped.
While the telephone providers are required to be common carriers, there is an ongoing net neutrality debate about the obligations of ISP's. [3] Telecommunications policy addresses the management of government-owned resources such as the spectrum, which facilitates all wireless communications. There is a naturally limited quantity of usable ...