[SIPForum-discussion] Delayed 100 Trying

Shah Hussain Khattak shahhusayn at msn.com
Mon Aug 10 13:03:33 UTC 2015

I have two questions: 
Have you checked why server is not generating 100 Trying right away after receiving Invite? As per my understanding your Proxy server should generate 100 Trying after getting Initial Invite from Client A. As only call signaling is going on, if client B is not getting any Acknowledgement from Client A side, i think the call should timeout after a few instances anyway..
I will wait for for more experts to comment on this.. 
Regards, Shah Hussain 

An ounce of practice is worth more than tons of preaching. (Mohandas Gandhi)
"In three words I can sum up everything I've learned about life: it goes on." (Robert Frost)

Date: Tue, 21 Jul 2015 12:41:14 +0530
From: rajkumaradass at gmail.com
To: discussion at sipforum.org
Subject: [SIPForum-discussion] Delayed 100 Trying

I have observed a case where in 100Trying & 180ringing response for a initial INVITE message is delayed beyond 32seconds(TCP transport being used here) causes the client B to remain in a hung call state, as the T1 timer expiry eventually causes dialog cleanup at the server side as below.

Client A ------  Server ------- Client B
                       --- INVITE ----->                       @32seconds(T1 timer) fires and cleansup the dialog                       after say 40 seconds                       <---100 Trying---                       <--- 180 Ringing --
In such case, is there any standard described way to get this cleaned up at Client B side as well?  Is this covered up in any drafts?

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