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

Karthikeyan Selvaraj karthikeyan.selvaraj at sasken.com
Tue Aug 2 04:27:32 UTC 2011

The expire in contact header is talk about the expire time to register for that contact. Contact headers contain more that one contact.. each contact may have different registrar. so each contact have the expire time. If there is no expire time. It will take expire header's time value for each contact.

The expire header is talk about the expire time for the sip message. Contact header doesn't have any expire, it will take the value from this header....

Karthikeyan S

From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of biharilal gupta
Sent: Sunday, July 31, 2011 10:41 PM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] Expires header vs expires parameter in Contact header

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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