What could be causing this issue?

An IP phone user reports that they are unable to set the Call Forward All feature on their phone. The user reports that they press the CfwdAll softkey and enter the desired telephone number, but the phone does not accept it.

What could be causing this issue?
A . The user is entering too many digits for the destination number.
B . Cisco Unified Communications Manager does not control Call Forward.
C . The Call Forward All service parameter is not enabled.
D . The Call Forward All option of the IP phone does not have a CSS defined.
E . The Call Forward All enterprise parameter is not enabled.

View Answer

Answer: D