3.1 isGateway Details

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UAC Behavior

If a UAC has a gateway role, it MUST insert the isGateway parameter in the Contact header. Otherwise, it MUST NOT insert this parameter in the Contact header.

UAS Behavior

If a UAS receives a SIP message with a Contact header that includes an isGateway parameter, it SHOULD render it to the application. The application MAY display this information to the user.

Proxy Behavior

This parameter does not affect a SIP proxy.