Nagesh, My question was why Transferor is sending INVITE (unhold) when NOTIFY (486 Busy) is received. It can directly send BYE message.
-Udit Nagesh Shekar <[EMAIL PROTECTED]> 04/20/2005 06:35 PM Please respond to [EMAIL PROTECTED] To Udit Goyal/C/US/[EMAIL PROTECTED] cc SIP Implementors <[email protected]> Subject Re: [Sip-implementors] Failure transfer scenario Udit, NOTIFY is required to end the impicit subscription that is created by the Transferor, when it sends the REFER out. Shekar [EMAIL PROTECTED] wrote: >In the SIP CC Transfer, for failure transfer cases, why transferor sends >INVITE(unhold) followed by BYE >on receiving NOTIFY (with failure status). > >It can directly send BYE to Transferee. Is there any specific reason for >doing this in the mentioned call flow. > >5.3.1 Target Busy > > Transferor Transferee Transfer > | | Target > | | | > | INVITE | | > Call-ID:1 |<-------------------| | > | 200 OK | | > Call-ID:1 |------------------->| | > | ACK | | > Call-ID:1 |<-------------------| | > | INVITE (hold) | | > Call-ID:1 |------------------->| | > | 200 OK | | > Call-ID:1 |<-------------------| | > | ACK | | > Call-ID:1 |------------------->| | > | REFER | | > Call-ID:2 |------------------->| | > | 202 Accepted | | > Call-ID:2 |<-------------------| | > | NOTIFY (100 Trying)| | > Call-ID:2 |<-------------------| | > | 200 OK | | > Call-ID:2 |------------------->| | > | | INVITE | > Call-ID:3 | |------------------->| > | | 486 Busy Here | > Call-ID:3 | |<-------------------| > | | ACK | > Call-ID:3 | |------------------->| > | NOTIFY (503 Service Unavailable) | > | or NOTIFY (486 Busy Here) | > Call-ID:2 |<-------------------| | > | 200 OK | | > Call-ID:2 |------------------->| | > | INVITE (unhold) | | > Call-ID:1 |------------------->| | > | 200 OK | | > Call-ID:1 |<-------------------| | > | ACK | | > Call-ID:1 |------------------->| | > | BYE | | > Call-ID:1 |------------------->| | > | 200 OK | | > Call-ID:1 |<-------------------| | > > >-Udit >_______________________________________________ >Sip-implementors mailing list >[email protected] >http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors > > > >
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