Which issue would cause an MGCP gateway to fail to register with Cisco Unified Communications Manager?
A . missing the configuration command isdn bind-l3 ccm-manager under the ISDN interface
B . mismatched domain name on the MGCP gateway and Cisco Unified Communications Manager gateway configuration
C . misconfigured route group in Cisco Unified Communications Manager
D . incorrect MGCP IP address specified in the gateway configuration in Cisco Unified Communications Manager
Answer: B