Calls to the desk set also ring on an associated cell phone. This is called termination mapping.

When an Extension to Cellular call is made to the cell phone:

When a user answers a call with a cell phone, Communication Manager treats the call as a local answer of a station.

Sometimes users do not require physical office numbers. Therefore, you can map the cell phones to an administration without hardware (AWOH) extension.

Extension to Cellular depends on ISDN PRI/BRI, R2MFC or SIP facilities to the PSTN. The customer must have ISDN PRI/BRI , R2MFC or SIP trunks enabled and have the appropriate media module and the service from the PSTN.

Extension to Cellular users can access standard cellular features such as incoming call waiting and caller ID. If the cell phone and cellular network support call waiting, you can administer Extension to Cellular to deliver calls to a busy cell phone. Users can use cell phone features, such as swapping calls or conference calls, to answer the second call and manipulate the two calls.

If the cell phone and network support calling number identification, Communication Manager delivers the calling number to the cell phone. For calls that originate internally, the calling number can be presented in either the national numbering plan format or as an extension. You can control the number format through the administration of calling number identification. Note, some networks cannot carry an extension as a valid number. Some cell phone networks only pass calling number information in the national format, while others are more flexible.