[SIPForum-discussion] The process sequence

Karthik Ramiya Karthik_Ramiya at infosys.com
Fri Jun 19 08:42:13 UTC 2009


   But is 180 ringing really needed when we get a 183 in the firstplace??


From: discussion-bounces at sipforum.org [discussion-bounces at sipforum.org] On Behalf Of NEERAJ JAIN [neeraj.jain at samsung.com]
Sent: Friday, June 19, 2009 11:48 AM
To: Mike Jiang; discussion at sipforum.org
Subject: Re: [SIPForum-discussion] The process sequence

Hi MIke,

183 session progress is generaly used when user is intrested in resource reservation according to 3GPP spec. Genrally 183 and PRACK is used to do the media negotiation before user is alerted. So it always comes before 180 ringing.



------- Original Message -------
Sender : Mike Jiang<mike.jiang at andersontaylor.com>
Date : Jun 19, 2009 02:35 (GMT+09:00)
Title : [SIPForum-discussion] The process sequence

Hi All,
      One quick question: I was wondering if the Ringing (180) is always occurring ahead of the Session Progress (183).
      In my case, the 183 response always happened before the 180 happened.


      Mike J.

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