The SIP UPDATE method, as per RFC 3311, allows you to update parameters of a session. While a call is in a queue, Experience Portal allows the SIP UPDATE method to update the following parameter of the call:
User-to-User Interface data
You can send multiple UPDATE messages after the initial INVITE is established and before the final response to the INVITE.
Note:
Experience Portal supports SIP UPDATE method only if the Allow header indicates support.
