Session Initiation ProtocolSIP :- It is a textual content based protocol accountable for the institution, administration and tearing down of media periods in an Internet Protocol (IP) setting.

This tag is for support of the session timer extension. Inclusion in a Supported header subject in a request or response indicates that the UA is capable of performing refreshes in accordance with that specification. Inclusion in a Require header in a request signifies that the UAS must understand the session timer extension to process the request. Inclusion in a Require header area in a response signifies that the UAC must search for the Session-Expires header area within the response, and course of accordingly.

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