Phone devices and phone numbers
In the CallManager Express configuration there are phone numbers assigned to line buttons on the phones. Each phone device may have one or more phone numbers. A phone number may be assigned to one or more phone devices (shared lines). There can be user accounts that have a list of phone numbers. These users can log in on especially configured phone devices (extension mobility).
Unambiguous phone numbers
The Tapi driver is designed for systems where each person has a unique extension phone number. This phone number of the person is configured as first line button on all of his phone devices. In case of an extension mobility user this is the first phone number in his user profile.
Each phone device that has a static configuration (no extension mobility) appears as Tapi line. The primary view on this phone device is the view on the first line button on the phone. These lines all have a phone number (phone number of the first line button) and a device-ID (MAC address of the phone device where this phone numbers is configured as the first line button). Optionally, additional line buttons from the phone device may be represented as Tapi addresses on the Tapi line.
Extension mobility lines
Each extension mobility user is represented by a Tapi line. The primary view on this user is the view on the first line button in the user profile. These lines all have a phone number (phone number of the first line button) and no device-ID. Optionally, additional line buttons from the user may be represented as Tapi addresses on the Tapi line.
View of the phone device, additional line buttons
Each Tapi line may represent the first line button and the additional line buttons. If the option 'Readout line buttons' from the advanced settings is active, the additional line buttons on each phone device will be loaded from the CallManager. All phone calls appearing on the phone device (no matter on which line button) are signalled on this Tapi line. The additional line buttons are represented as Tapi addresses.
Status of the phone devices
Each Tapi line may be monitored, independent of the phone device registration status. The status of the line is 'Out Of Service' if there is no phone device registered. The status changes to 'In Service' as soon as the phone device registers with the CallManager.