[SIPForum-discussion] Expires header vs expires parameter in Contact header

HM Kias hmkias at gmail.com
Mon Aug 1 23:09:38 UTC 2011

*Contact: sip:kias at kias.net ;expires=1800*
Add Contact to current registrations;
registration expires in 30 minutes.

When present in an INVITE request, the header field sets a time limit on the
completion of the INVITE request. The UAC must receive a final response
(non-1xx) within the time period or the INVITE request is automatically
canceled with a 408 Request Timeout response. Once the session is
established, the value from the Expires header field in the original INVITE
has no effect—the Session-Expires header field must be used for this
purpose. When present in a REGISTER request, the header field sets the time
limit on the URIs in Contact header fields that do not contain an expires

On Sun, Jul 31, 2011 at 10:40 PM, biharilal gupta <guptabihari at yahoo.com>wrote:

>   Hello All,
> Can someone pls explain what is the difference between "Expires header vs
> expires parameter in Contact header". In what condition or scenario expires
> parameter is used in Contact header.
> Thanks & Regards,
> *Bihari Lal Gupta*
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HM Kias
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