Because the cell phone is treated as a local extension on the Avaya server running Communication Manager, the telephone can be completely integrated with the corporate voice messaging system. However, the cell phone can also keep the cellular service provider voice mail. This dual messaging capability presents an issue of where a user wants the message to go: corporate voice mail or cellular voice mail.
With regards to voice mail functionality and Extension to Cellular:
The office number retains the primary extension on the Avaya server running Communication Manager.
Calls to the office number simultaneously ring the office number and the cell phone. If neither answers, standard coverage arrangements take effect.
As needed, you can disable Extension to Cellular when not in use to ensure that all unanswered calls go to the corporate voice messaging system.
The system administrator can control in-service and out-of-service status of the mapped extensions through a busy out and release maintenance capability. An unanswered call either ends at the corporate voice mail system or at the cellular service provider (CSP) voice mail system. The amount of control over the terminating voice mail system is limited. As administrator, you can use Cellular Voice Mail Avoidance and ring timing to direct Extension to Cellular calls to the appropriate voice mail coverage. See also, Cellular Voice Mail Avoidance Using Confirmed Answer.
