The SBC is dynamically determining, for each endpoint, the logest "expires=" value (returned to it in the 200 OK)
The test timer is initialized to the same value as the nat-interval (30 sec). The initial value chosen for the “Expires=” is the test timer value + 10 sec (=40 sec). Thirty seconds after sending the 200 OK, the SBC sends an unsolicited SIP message (It uses the OPTIONS method for that.) and waits for a SIP response (It is assumed that the firewall does not return any SIP response.). A SIP response is returned; therefore, the test is successful and a longer “Expires=” value will be attempted upon the next REGISTER request.
Correct answer: D
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2D
Highly Voted 5 months ago