See RFC 3261 Section 10.2.1.1 10.2.1.1 Setting the Expiration Interval of Contact Addresses
When a client sends a REGISTER request, it MAY suggest an expiration interval that indicates how long the client would like the registration to be valid. (As described in Section 10.3, the registrar selects the actual time interval based on its local policy.) There are two ways in which a client can suggest an expiration interval for a binding: through an Expires header field or an "expires" Contact header parameter. The latter allows expiration intervals to be suggested on a per-binding basis when more than one binding is given in a single REGISTER request, whereas the former suggests an expiration interval for all Contact header field values that do not contain the "expires" parameter. Thanks, Neel. From: [email protected] [mailto:[email protected]] On Behalf Of Gert Olsson Sent: Tuesday, January 20, 2009 6:26 AM To: [email protected] Subject: [Sip] SIP de-REGISTER: Expires header vs expires parameter i Contact Hi, SIP de-registration is performed by sending a REGISTER message with either a Contact header containing an 'expires=0' parameter or an Expires header with value 0. My question is: is it FORBIDDEN to have both? Shouldn't any decent server, if it has found 'expires=0' in the Contact header (or in all if many), just happily ignore an Expires header? [Neelakantan Bala] See RFC 3261 Section 10.2.1.1 10.2.1.1 Setting the Expiration Interval of Contact Addresses When a client sends a REGISTER request, it MAY suggest an expiration interval that indicates how long the client would like the registration to be valid. (As described in Section 10.3, the registrar selects the actual time interval based on its local policy.) There are two ways in which a client can suggest an expiration interval for a binding: through an Expires header field or an "expires" Contact header parameter. The latter allows expiration intervals to be suggested on a per-binding basis when more than one binding is given in a single REGISTER request, whereas the former suggests an expiration interval for all Contact header field values that do not contain the "expires" parameter. Thanks, Neel. br /GO __________________________________________________________________| Gert Olsson / phone: +46 10 7154604 / e-mail: [email protected] Ericsson AB - Business Unit Mobile Platforms, SE-221 83 Lund, Sweden
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