Hi, The purpose of Subscription is to notify the Referring party about the state of the new call due to refer. This is mainly used to identify if call is successful or failed. Now based on response the referring party decided to terminates the call or retrieve the referred call.
If before the completion of 2XX response from the new call out of refer, if user wants to terminate the Subscription, the Notify can have the current status of New call in SIP frag message, be it 100 Trying or any other 1XX response. There is nothing specific about it in RFC. Regards Sunil Verma -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Sunil Sent: Tuesday, October 05, 2010 10:13 AM To: [email protected] Subject: [Sip-implementors] Can Notify with empty body be sent by NOTIFIERto Terminate REFER subscribtion? Hi All, As RFC3515 says that "Each NOTIFY MUST contain a body of type "message/sipfrag" .The body of a NOTIFY MUST begin with a SIP Response Status-Line". But if Notifier Receives Subscribe with expires zero to Un-subscribe the REFER subscription,Can the Notifier send NOTIFY request with Subscription-State as terminated and with empty body. Regards, Sunil _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
