[SIPForum-discussion] [SIP Forum Discussion] INVITE requestfollowed by CANCEL

malaya.kishore at wipro.com malaya.kishore at wipro.com
Fri Apr 17 06:34:29 UTC 2009

Hi Ashutosh,


408 Request Timeout, will come for any Request for which there is no

In this case, there will be answer like "100 Trying" and "180 Ringing",
so there won't be any timeout's.


If there is no response from the Recipient "Called Party", the
Originator "Calling Party" will generate a CANCEL request, once the
expires timer is reached (The time is indicated in the Expires header
field in the INVITE request).

For the CANCEL request the Recipient "Called Party" answers with "200


Hope this helps.


Kind Regards,




From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Ashutosh Panda
Sent: Thursday, April 16, 2009 10:04 AM
To: rajeshk.r at samsung.com
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] [SIP Forum Discussion] INVITE
requestfollowed by CANCEL


Thanks for youre fruitful responses. 


In second scenario(Question 2), will there be any responses sent to
called party....or called party will change its state itself??
Also, if server will first start CANCEL or the calling party will send
408 Request TImeout?




On Wed, Apr 15, 2009 at 7:01 PM, RAJESH KUMAR RAJU
<rajeshk.r at samsung.com> wrote:

Hi , 

For Q1 : 
send 486 Busy


For Q2 : Cancel will come but no idea if any error response will come or



Thanks and Regards 


------- Original Message -------
Sender : Ashutosh Panda<ashubdk at gmail.com>
Date : Apr 14, 2009 20:45 (GMT+09:00)
Title : [SIPForum-discussion] [SIP Forum Discussion] INVITE request
followed by CANCEL

Hello Everybody, 

I have doubts in following two issues. Hope I can find my answer through
this forum. Thanks in advance. 

Question 1. 

Forking is supported. 

Originator calls recipient which is registered at many places. 

Server attempts the calls at all the registered places of recipient but
it receives No Answer/Busy from all places. 

Now, will the server send 486 Busy or 603 Decline response to the
originator of the call? 

Question 2: 

Originator calls recipient. 

Recipient does not answer the call (though recipient sends 180 Ringing) 

When timeout occurs, will the server send any error response (or CANCEL
request) to the callee and called parties or the callee will initiate
call termination process. 


Ashutosh Panda





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