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External transfers were working fine, but agents were complaining that if the external party didn't answer the phone they could not hangup the xfer line. I read through similar posts and set the 3-way prefix to 88 so the agents could hear the ringing. This worked well because the agents could then hangup the xfer line. This worked for a few days then all of a sudden the external transfers stopped working. Agents no loner heard any ringing and the calls were not being transferred. I checked asterisk and noticed that calls were being sent as 88-1-phone number rather than 88-dial prefix-1-phone number. I removed the 88 3-way prefix, but the external transfers are still not going through. It seems to be sending the correct pattern but times out. I have tried using different carriers.
I can successfully transfer if I use dial override and put the dial prefix + 1 in front of the number, but then I loose the ability to hangup.
Does anyone have any suggestions of what I should check?

88 uses the dial 9 prefix. If dial 9 "goes away" because you don't pay the phone bill for that particular telco, then 88 will go away as well.

Please post your installation method with version .. it helps.

I have never had a carrier set up with dial prefix 9, so that explains why the 88 doesn't work now...but why did it work for a couple days? I didn't have any carrier with dial prefix 9 during the days that it did work.

You'd have to look at the asterisk CLI from when it worked. Likely you had a "test" carrier configured and ran out of $$.

Hi Good day!

If you are concern with the additional 1 phone code aftet your prefix "88" then you can simply change the "Omit Phone Code to NO" so that when you are dialing it will not be include. It will be just your prefix number "88" + Phone number.


Cheers!

The phone code is not the issue.