SS II komplet_2011-2012.pdf

SIP Basics (1)
› The Session Initiation Protocol (SIP) is a text based client-server protocol for
peer-to-peer communication.
› The design base was HTTP and SMTP
› SIP is used to establish, modify and terminate IP multimedia sessions.
› SIP is able to establish a broad range of IP multimedia sessions:
– Voice and/or video
Client
Server
– Gaming
– Presence and Instant Messaging
Request
› SIP messages
SIP
are
is
either
not:
requests or responses.
Response
› SIP messages carries zero or more “bodies”.
› The Session Description
• transport
Protocol (SDP)
protocol
is the common body for session
initiation.
› SIP runs on a transport
• QoSprotocol reservation
(UDP, TCP, TLS, SCTP)
protocol
– UDP and TCP are mandatory. The other transport protocols are optional
• gateway control protocol
Matus Turcsany | © Ericsson AB 2010 | December 2011 | Page 21