Hi All, 487 response will be generated only when a CANCEL will be generated for a pending INVITE message. CANCEL request has all the information, like which request with all mandatory header field. A cancel will be generated from a proxy otherwise same UA which has generated invite. 487 will be responded by the other party. So its not at all require to have To tag in non 2xx responces for invite. Please comment. Thanks Aditya
________________________________ From: [EMAIL PROTECTED] on behalf of [EMAIL PROTECTED] Sent: Thu 11/13/2008 6:19 PM To: [email protected] Subject: [Sip] Is To-tag in non 2xx response mandatory Hi, Should a to-tag be added to a 487 response to an initial INVITE? Even if 180 Ringing has not been sent? Regards, Sunil
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