I ran into an issue recently with a customer that had a branch office with four analog lines. They wanted to utilize the carrier’s call-forwarding feature instead of a CUCM-based solution for survivability reasons.
The carrier used *72 and *73 to turn on/off call-forwarding.
I had an issue getting call-forwarding to work, but I eventually figured it out.
Setup a route pattern in CUCM for something like 8*7[23]. Send this to the gateway. On the gateway, define a POTS dial-peer explicitly stating which analog port to seize. You’ll also want to do a “forward-digits 0″.
When you dial the 8*7[23] from an IP phone (or better yet, program it as a speed dial), you will get carrier dial-tone. At that point, you can enter the carrier’s forwarding codes (e.g. *72 or *73).
Here’s a brief output of the relevant IOS commands:
voice-port 1/0/8
description XXX-XXX-XXXXdial-peer voice 20 pots
destination-pattern 8*7[23]
progress_ind progress enable 8
progress_ind connect enable 8
port 1/0/8
forward-digits 0
Hi Matthew,
Please, explain dial plan in lab, "+" sign and numbering type call to pstn. I rarely understand them.