[SIPForum-discussion] The process sequence

Vivek Batra Vivek.Batra at matrixtelesol.com
Sat Jun 20 03:50:50 UTC 2009

Right Kartik, since RBT can also be played in media by remote server, but
what if gateway wants to disconnect the media once call has been placed to
actual called party.....? 
This can be done only be sending 180 Ringing after 183 Session Progress!

Best Regards,
Vivek Batra

-----Original Message-----
From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Karthik Ramiya
Sent: Friday, June 19, 2009 2:12 PM
To: neeraj.jain at samsung.com; Mike Jiang; discussion at sipforum.org
Subject: Re: [SIPForum-discussion] The process sequence


   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



------- 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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