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What Is The Significance Of The Expires Header In An Invite Message? |
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Answer» An Expires header in an INVITE indicates to the UAS how long the CALL request is valid. For example, the UAS could leave an UNANSWERED INVITE request displayed on a screen for the duration of SPECIFIED in the Expires header. Once a session is ESTABLISHED, the Expires header has no meaning—the expiration of the time does not terminate the media session. Instead, a Session-Expires header can be used to place a time limit on an established session. An Expires header in an INVITE indicates to the UAS how long the call request is valid. For example, the UAS could leave an unanswered INVITE request displayed on a screen for the duration of specified in the Expires header. Once a session is established, the Expires header has no meaning—the expiration of the time does not terminate the media session. Instead, a Session-Expires header can be used to place a time limit on an established session. |
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