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[ScreenOS] What is the purpose of the registration expiry timer in the SIP protocol?

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Article ID: KB25687 KB Last Updated: 05 Sep 2012Version: 1.0
Summary:
This article provides information about the function of the registration expiry timer in the SIP protocol.
Symptoms:
Information about the function of the registration expiry timer in the SIP protocol.
Cause:

Solution:
In the SIP message, when a client sends a REGISTER request, it may suggest an expiration interval; which indicates how long the client would like the registration to be valid (as described in Section 10.3 of RFC 3261, the registrar selects the actual time interval, based on its local policy).

There are two ways, in which a client can suggest an expiration interval for a binding; via an Expires header field or an Expires Contact header parameter. The latter allows the expiration intervals to be suggested on a per-binding basis, when more than one binding is given in a single REGISTER request. Whereas, the former suggests an expiration interval for all Contact header field values, which do not contain the expires parameter.

If neither of the above mechanisms is present in a REGISTER request, the client is indicating its desire for the server to choose.
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