Panasonic KX-TDA 15 - Up to 20 extensions (suitable for remote branches and homeworkers)
The KXTDA15 is a hybrid IP PBX system to fulfil customers requirements today and in the future. It can be configured to meet present needs and expand as applications grow or change. The Panasonic KX-TDA15 Phone System has a maximum capacity of 8 telephone lines and 20 extensions.

Panasonic KX-TDA 30 - Up to 52 extensions
The KXTDA30 is a hybrid IP PBX system to fulfil customers requirements today and into the future. It can be configured to meet their present needs and expand as their applications grow or change. The Panasonic KX-TDA30 Phone System has a maximum capacity of 12 telephone lines and 52 extensions.