3.9.6.1 Registered Endpoint Timer Expiry

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When the registered endpoint timer expires, the following actions MUST be executed by the server:

If the Ms-Sensitivity header field value does not contain no-diversion and the incoming INVITE is not targeted at the private line of the user and the enablecf flag is set:

  1. The call MUST be forwarded to the destination defined in the forwardto list.

  2. A 181 response MUST be sent back to the caller indicating that the call is being forwarded.

  3. The call forwarding timer MUST be started.

    If the Ms-Sensitivity header field value does not contain no-diversion and the enablecf flag is not set and voice mail is configured for the callee:

  4. The call MUST be forwarded to voice mail by setting the Request URI field to the user’s voice-mail-gruu as defined in section 2.2.3, and

  5. A 181 response MUST be sent back to the caller indicating that the call is being forwarded.