In the integration of Cisco Unity Connection using SIP, which SIP trunk security profile option is required for MWI to work correctly?
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A. B. C. D.A.
When integrating Cisco Unity Connection with SIP, there are several SIP trunk security profile options available. However, to ensure that MWI (message waiting indicator) works correctly, the "Accept unsolicited notification" option is required.
MWI is a feature that allows a user to be notified when they have a new voicemail message waiting for them. When a user receives a new voicemail message, the Unity Connection server sends a SIP NOTIFY message to the user's phone, indicating that there is a new message waiting. The phone then turns on the MWI light or displays an icon to indicate the new message.
The "Accept unsolicited notification" option is required for the SIP trunk security profile to accept the NOTIFY message sent by the Unity Connection server without requiring a previous SIP dialog to be established. This option allows Unity Connection to send the NOTIFY message to the phone even if the phone has not explicitly subscribed to receive notifications from Unity Connection.
Therefore, the correct answer to the question is C, "Accept unsolicited notification."