Hi, I have a situation where a phone sends a REGISTER message with "expires=3600" in the Contact Header. The SIP registrar replies back with "Expires: 300" in the 200 OK response. In such a situation, which of these 2 values should be taken as the actual expiration interval ? RFC 3261 -> section 10.3 is slightly obfuscated. In one instance it states that if REGISTER request has an "expires" parameter or if the request has an "Expires" header field, that value MUST be taken as the requested expiration. Then, it also states that registrar MAY choose an expiration less than the requested expiration interval. Does this mean that the value in the 200 OK message takes precedence ? thanks, venkatesh joshi
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