Implementing Cisco Advanced Call Control and Mobility Services (CLACCM) — Question 185

After a new SIP trunk is configured from a third-party SIP trunk provider, the call does not seem to work. A troubleshooting tool and a trace log from the Cisco Unified Border Element shows that there is communication with the provider and that it is sending out SDP information in the 2XX response. Why is the call not working?

Answer options

• A. The Cisco Unified Border Element does not have any PDVM resources to terminate the SIP trunk assigned.
• B. The SIP provider expects a delayed offer.
• C. The SIP provider expects an early offer.
• D. The Cisco Unified Border Element must be licensed for third-party SIP trunks.

Correct answer: C

Explanation

The correct answer is C because the SIP provider expects an early offer, which means it needs the SDP information to be sent immediately after the INVITE. If the Cisco Unified Border Element is not configured to send an early offer, the call setup will fail. The other options are incorrect as they do not address the specific issue with the offer type expected by the SIP provider.