Their Dial Plans are simmilar to Mango Switchboards
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Go to Phone Numbers and see which dial plan the phone number routes to
a. If it doesn't route to a dial plan, then create one and route the main number to it after making the following edit. -
Edit the dial plan so that it only goes to an external transfer of the temporary number with a timeout of 120 and pass through the caller id.
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Repeat for any other numbers you're forwarding.