[SIPForum-discussion] Implementation of Session Inprogress

[Timothy D Barker]

  Here is the original 183 RFC-Draft.

draft-donovan-mmusic-183-00.txt

183 is mostly used during SIP-PSTN interworking call-flow.
Allowing the creation of a 1-way mid-call media session from the Called UA to the Calling UA.
One example is to allow the Called-UA to play music indicating the call is progressing.

===
Tim

  ---- Original message ----

    Date: Mon, 2 Nov 2009 22:40:54 +0530
    From: kks balaji <balaji.sivam at gmail.com>
    Subject: [SIPForum-discussion] Implementation of Session Inprogress
    To: discussion at sipforum.org

    Hi,

    Anyone can explain the session progress(183) and ringing
    response(180) in SIP.

    Thanks in advance,
    Balaji.

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