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To add a new extension to the system, click on the button at the bottom-right corner of the Trunks list panel, as shown below:
Click on the button beneath the Trunks list (right-hand window), to display the
following window. Enter the trunk number and a name for the new trunk in the respective text boxes and press
the button. If you don't enter a name, TIM will provide
one in the form Extn x where x is the number of the trunk.
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