Implementing Cisco Collaboration Applications (CLICA) — Question 157

A collaboration engineer is troubleshooting MWI issues with Cisco Unity Connection and Cisco UCM. Users report that MWI lights do not work when a new message is received. After doing a packet capture, the engineer notices that Unity Connection sends a SIP Notify to Cisco UCM for MWI. Cisco UCM responds with a SIP 503 Service Unavailable message. Which action resolves the issue?

Answer options

• A. Configure the SIP server list on the Cisco Unity Connection port group to match the Cisco UCM device pool settings on the SIP trunk.
• B. Assign the proper voicemail profile to the directory numbers on Cisco UCM.
• C. Uncheck “Send Message Counts” on the phone system settings on Cisco Unity Connection.
• D. Uncheck “Accept unsolicited notifications” on the SIP trunk security profile.

Correct answer: C

Explanation

The correct answer is C because unchecking 'Send Message Counts' allows the system to stop sending MWI notifications that are causing the SIP 503 error. The other options do not directly address the issue of the service being unavailable and may not resolve the MWI functionality.