The Avaya Extension to Cellular feature provides users with the capability to have one administered telephone that supports Communication Manager features for both an office telephone and up to four outside telephones. An office telephone is a telephone that is directly under the control of Communication Manager, such as a desk telephone in an office. The outside telephone is a cellular or wireless telephone and is referred to in this text as a cell phone. Extension to Cellular works with any type of wireless or cellular service.

With Extension to Cellular, users can receive and place official calls anywhere, at any time, even if the users are not in the office. In addition, users can also access Communication Manager features through the cell phone. Users can enable and disable Extension to Cellular so that the cell phone does not always receive office telephone calls. Users can also switch between the cell phone and office telephone during an ongoing Extension to Cellular telephone call.

When Extension to Cellular is administered and active, a call to the office telephone extension alerts both the office telephone and the cell phone simultaneously. In addition, Extension to Cellular maintains consistency in contact information. The cell phone takes on the identity of the office telephone when calls are made from the cell phone to another number on the same switch as the cell phone sends the caller ID information of the office telephone of the caller. Therefore, calls from the cell phone appear to be from the office telephone number.

A user operates a cell phone as if it were a standard, caller ID-enabled telephone extension connected directly to an Avaya server running Communication Manager. The cell phone acts as an extension because the cell phone is mapped to the main office telephone. All other types of cell phone calls, such as direct calls to and from the published cell phone number, are not affected by Extension to Cellular. The cell phone performs exactly as it did before enabling Extension to Cellular. If your Cellular Service Provider (CSP) provides this service, Extension to Cellular is always enabled. You can also enable or disable Extension to Cellular by using a Feature Name Extension (FNE), as described in Setting up Feature Name Extensions set.

Cellular service providers who resell the Extension to Cellular service use the CSP or SPFMC (Service Provider Fixed-Mobile Convergence for dual mode phones) application type. CSP/SPFMC support ISDN, H.323, and SIP trunks. CSP/SPFMC is essentially the same as the Extension to Cellular application. Unlike Extension to Cellular, CSP/SPFMC is always enabled. With CSP or SPFMC, users cannot disable Extension to Cellular.

The Extension to Cellular feature also supports Fixed Mobile Applications (FMC), Public Fixed Mobility (PBFMC), and Private Fixed Mobility (PVFMC). The FMC applications are used for wireless endpoints that support a one-X Mobile Client application that has two modes called SMode (Single Mode) and DMode (Dual Mode). The FMC applications (PBFMC, PVFMC, and SPFMC) are the only OPTIM applications that support the CTI Mobility Integration feature.

When both the PBFMC and the PVFMC applications are administered for a station, incoming calls to that station are forked to both the public and private destinations specified in the station-mapping administration list. If the private FMC application receives a message indicating that the far-end has answered the call, Communication Manager cancels the call on the public FMC application. Reception of an alerting indication means that the wireless endpoint must be present in the private wireless network and therefore cannot be in the cellular network.

See also Application RTUs for Fixed Mobile Convergence.