The response will
contain the AUTHENTICATE header containing the proper credentials.
Authorization: Digest realm="raleigh.com",
domain= "sip:tekelec.com", qop="auth",
nonce="dcd98b7102dd2f0e8b11d0f600bfb0c093",
opaque="5ccc069c403ebaf9f0171e9517f40e41"
Session Description Protocol (SDP)
The session description protocol is what describes the session being requested. For
example, for a voice call the codecs that are used to convert the voice transmission to
digital must be identified in the SDP so that the receiving end knows how to decode
the voice at the other end.
The SDP is carried in the message body of a SIP request/response. Each attribute
line consists of an attribute identified by a single letter, followed by a value. The attributes
defined for SDP follow. They are defined by these categories:
?– Session Level Description
84 Chapter 3
?– Time Description
?– Media Description
Session Level Description
?– v = protocol version This is the version of SDP being used to create the SDP.
?– o = owner/creator and session identifier The identity of the session
initiator.
?– s = session name Optional name that can be given to the session, such as
???Travis??™s Webinar.???
?– i = session information Additional information that the creator of the session
wishes to share with participants
?– u = URI of description This contains the URI of a Web site that may contain
additional information about the session.
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