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Published Option
Default Value: 0
Valid Values: Any positive integer
Changes Take Effect: On the next REGISTER request
Specifies the expiration timeout for a REGISTER request as a value, in seconds, in the 200 OK response that is sent by SIP Proxy to the SIP endpoint, and as a value in the REGISTER request that is forwarded to SIP Server. When this option is set to 0, or is not defined, the expires value from the Contact or Expires headers from the REGISTER request is used as the expiration timeout. If the option is set to any value other than 0, the timeout is set to the lesser of the option value and the value specified by the client.
Draft Option
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