Refer to the exhibit. An engineer is deploying mobile and remote access in an environment that already had functioning Business to Business calling. Mobile and remote access SIP registrations are failing. To troubleshoot, SIP logs were collected. How is this issue resolved?
A. Change the SIP profile on the SIP trunk for the Expressway-E to Standard SIP Profile for TelePresence Endpoint
B. Change the “Incoming Port” in the SIP Trunk Security Profile for the Expressway-C to not match SIP line registrations
C. Enable autoregistration for the appropriate DN range on the Cisco UCM servers running the CallManager service
D. Write a custom normalization script since the “vcs-interop” normalization script does not allow registrations
