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3.1.5.5 CPS Receives a BYE on the Audio Dialog with the Parkee

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CPS MUST process the BYE as specified in [RFC3261] section 15. If the CPS is in the process of performing a transfer of the retriever to the parkee or if the parker-CPS dialog no longer exists, the CPS MUST NOT perform further processing for this event. Otherwise, the following additional steps apply.

The CPS MUST send a SIP INFO message on parker-CPS dialog with a Content-Type of " "application/ms-call-park+xml". The body of this message MUST be an unpark-notification. The version attribute MUST be set to "1.0". The request-id attribute MUST be set to that of the original park-request. The reason element MUST be set to "hang-up", and the target element MUST NOT be present.

After sending the preceding notification, the CPS MUST then send a BYE on the parker-CPS dialog. This BYE SHOULD include an ms-diagnostics code of 35014 as defined in [MS-OCER]. The CPS MUST return the orbit to the pool, and release any resources associated with the parked call.