You can create a custom extension with the appropriate dial string.
When you create the extension. In this caseexample, I’ve created an custom extension to dial the local Time/Temp number (6016385211) by dialing the last 4 digits of the number (5211).
In the Device Options section of the Create Custom Extension page, I’ve put “ZAP/g0/6016385211” in the dial box.
Now whenever anyone dials 5211, the call goes to the Time/Temp number.
I’ve done this with quite a numbers which still remain on our Centrex phone system so that users of the FreePBX system can continue to have 4 digit access to those numbers as they had before the FreePBX users migrated from Centrex.
Bill/W5WAF