Refer to the exhibit.
An engineer configured CCD between a Cisco Unified Communications Manager (CUCM) cluster and Cisco Unified Communications Manager Express (CME). When the CUCM agents try to dial a CME extension on the range 7XXX, they receive a busy signal as soon as the 7 is dialed.
What can be done to resolve this issue?
A . Set the CUCM CCD Requesting Service PSTN prefix to 9 instead of+
B . Set the CME profile dn-block type to extension instead of global
C . Set the CUCM Hosted DN Pattern PSTN Failover Strip Digits field to 1 instead of 0
D . Set the CME subscribe callcontrol to instance instead of wildcarded
Answer: A