VoIP - Local Extension Dialing

Centrex

This allows you to use the last 1, 2 or 3 digits of your phone number to call other numbers in your block. eg. if you have 2 numbers 01344400001 and 01344400002, then you can call eachother by using 001 and 002 if you set Centrex to 3. This is also used when you transfer calls between your numbers.