March 2006
Intermediate to advanced
464 pages
12h 16m
English
book
The IMS: IP Multimedia Concepts And Services, Second Edition
by Miikka Poikselka, Georg Mayer, Hisham Khartabil, Aki Niemi
Content preview from The IMS: IP Multimedia Concepts And Services, Second Edition
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14.1. The offer
An entity wanting to create a session or currently in a session can generate an SDP session description that constitutes the offer. This offer contains the set of media streams and the set of codecs the offerer wishes to use, as well as the Internet Protocol (IP) addresses and ports the offerer would like to use to receive the media.
The session line, or s-line, is always set to "-" or a single space in the offer/answer. Since signalling protocols, such as SIP, are used to create unicast sessions, the start and stop times in an SDP offer/answer exchange is set to 0 and 0, respectively.
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