Transcoding arrangement in a session initiation

Details Transcoding arrangement in a session initiation Transcoding arrangement in a session initiation

2007-11-27

2007-11-27

Tieu, Binh K. (Department: 2614)

Multiplex communications

Special services

Conferencing

C370S261000, C370S265000, C370S359000

Reexamination Certificate

active

10490439

ABSTRACT:
This invention relates to a SIP and SDP protocols. The idea of the invention is to modify SDP descriptions included in SIP messages to facilitate transcoding. After receiving an INVITE message from a calling party, the SIP proxy negotiates with a transcoder for getting a list of codecs of the transcoder and their address information. The SIP proxy adds the codec list of the transcoder to the received SDP description in the invite message, and sends this way modified SDP description in an INVITE message to a called party. After receiving the modified SDP, the called party selects codecs or a list of suitable codecs according to preferences in the modified SDP and its own preferences.

REFERENCES:
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patent: 2004/0076145 (2004-04-01), Kauhanen et al.
patent: 1 079 573 (2001-02-01), None
patent: WO 02/15625 (2002-02-01), None
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ETSI TS 124 229 V5.1.0 (Jun. 2002) Digital Cellular telecommunications System (Phase 2+), Umiversal Mobile Telecommunications System (UMTS): IP Multimedia Call Control Protocol based on SIP and SDP; Stage 3 (3GPP TS 24.229 version 5.1.0 Release 5) Retrieved from www.etsi.org.

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