[SIPForum-discussion] ExpiresHeader in Invite Message

[Abhishek Mishra]

Hi Amit,

Please see the comments inline.

Kind Regards,
-Abhishek


On Tue, 2007-07-31 at 12:24, amit wrote:
> hi all,
> 
> 
> when we are sending invite message with ExpiresHeader( with expire time
> 10 sec.)..
[Abhishek] I assume that you are sending the INVITE and hence you are
UAC
> 
> we are not received CANCEL after 10 sec. when we are not ACCEPTED the
> call.
[Abhishek] Here, your statement is conflicting. If you have sent INVITE
with Expires header equal to 10 seconds, then you would have to send
CANCEL after you INVITE method expires. In this case you would not
(infact can not) receive a CANCEL from UAS. If message is sent to the
proxy, then proxy may send "480 Request Timeout" after 10 seconds.

On the other hand, if you are UAS and you have received an INVITE with
Expires header, then you may expect CANCEL after the message expires. If
you are not receiving CANCEL, then the calling endpoint is misbehaving.
> 
> 
> 
> 
> 
> 
> Thanks & Regards,
> 
> Amit
> 
> _______________________________________________
> This is the SIP Forum discussion mailing list
> TO UNSUBSCRIBE, or edit your delivery options, please visit http://sipforum.org/mailman/listinfo/discussion
> Post to the list at discussion at sipforum.org