Users at a branch office report that they can make and receive calls, but the system is behaving differently: 1. Caller ID previously displayed on incoming outside calls but does not now 2. The name…

Users at a branch office report that they can make and receive calls, but the system is behaving differently: 1. Caller ID previously displayed on incoming outside calls but does not now 2. The name and number of the calling party displays on internal calls but is different now 3. Users can place callers on hold, but there is no music on hold while the caller is waiting What condition explains the system behavior?