The TTI Ports field on the System Capacity screen (type display capacity) shows the number of TTI ports used in a server running Communication Manager.

This field shows only the number of TTI ports being administered. If a TTI exceeds the maximum number of ports, the port is not administered and cannot be added. In that case, a telephone cannot be added. For details on the System Capacity screen, see Maintenance Commands for Avaya Aura® Communication Manager, Branch Gateways and Servers.

BRI endpoints are only counted as one TTI port. For example, for every two BRI endpoints, one TTI port is counted. As such, you can have two telephones assigned to one port. If either endpoint is administered, the TTI port count is reduced by 1.

The total number of translated telephones and Voice TTI ports in a system is limited to the maximum number of administered telephones supported in the system.

The total number of translated data terminals and Data TTI ports in a system is limited to the maximum number of administered data modules allowed in the system.

When you use this order, voice and then data (Set the TTI State field to voice and then set the TTI State field to data), you reduce the chance of a user trying to use TTI on a data-only terminal that does not have TTI port translation

This can happen when the number of telephones allowed by the system is twice the number of data terminals. For example, if the system limit for telephones is 15,000 and 7,500 for data, then when TTI was turned on for data first, only the first 7,500 unadministered ports would get TTI port translations.

When TTI is activated for the system, these actions take place

• If the TTI State field was previously activated but in a different state (such as, a voice to data state), the old TTI translations are removed and the new ones added on a board-by-board basis.

• If the TTI State field is set to voice, then default TTI translations are generated for every unadministered port on all digital, hybrid, and analog boards.

• If the TTI State field is set to data, then default TTI translations are generated for every unadministered port on all digital and data line boards in the system.

• Whenever a new digital board is inserted when the system is in TTI Data mode, or when a digital, hybrid, or analog board is inserted when the system is in TTI Voice mode, the unadministered ports on the board become TTI ports.

• When TTI is deactivated, all translation for the TTI ports is removed in the system, and the ports return to an unadministered state.