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Introducing the Incredible Redialer for Asterisk

If you’ve been a VoIP regular during the past decade then you’re probably already aware that the automatic redial function has disappeared from both Asterisk® and most SIP phones. In these difficult times of trying to connect with critical services and radio contests, we thought it was a good time to introduce the Incredible Redialer. It should perform well on most Asterisk platforms with FreePBX® as well as current releases of Incredible PBX®.

How It Works. The Incredible Redialer assumes you have an Outbound Route to process 10-digit calls. If not, you can adjust the code to meet your local or international calling patterns. For the default install, a caller simply dials 2 plus a 10-digit number, and the Incredible Redialer will repeatedly dial the 10-digit number every five seconds until the call completes without a busy signal. No CDR entries are logged to avoid clutter.

Installation. On FreePBX-based systems including Incredible PBX platforms, edit extensions_custom.conf in /etc/asterisk. Just below the [from-internal-custom] line at the top of the file, insert the following code:

;# // BEGIN Redialer
exten => _2NXXNXXXXXX,1,Answer
exten => _2NXXNXXXXXX,n(dialnow),Wait(5)
exten => _2NXXNXXXXXX,n,Set(NUM2CALL=${EXTEN:1})
exten => _2NXXNXXXXXX,n,Dial(local/${NUM2CALL}@from-internal)
exten => _2NXXNXXXXXX,n,Goto(dialnow)
exten => s-CANCEL,1,Hangup
exten => s-NOANSWER,1,Hangup
exten => s-BUSY,1(redial),Goto(dialnow)
exten => s-CONGESTION,1(congestion),Goto(dialnow)
exten => s-CHANUNAVAIL,1,Hangup
exten => s-,1,Hangup
exten => _s-.,1,Hangup
;# // END Redialer

If your dialplan requires 11-digit numbers beginning with a 1, then edit the five lines beginning with _2 and change the entries to _21. You can make similar changes to support international dialing prefixes. If you’d prefer a dialing prefix other than 2, then replace the 2 in the _2 lines with the prefix of your choice. Save the file and then reload your Asterisk dialplan: asterisk -rx "dialplan reload"

Testing Incredible Redialer. We’ve set up a test number in the United States that always rings busy. Feel free to call it to try things out from your own PBX: 843-606-0555. Enjoy!

Originally published: Monday, May 4, 2020

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The lynchpin of Incredible PBX 2020 and beyond is ClearlyIP components which bring management of FreePBX modules and SIP phone integration to a level never before available with any other Asterisk distribution. And now you can configure and reconfigure your new Incredible PBX phones from the convenience of the Incredible PBX GUI.

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  1. Check:
    Installation. On FreePBX-based systems including Incredible PBX platforms, edit extensions_custon.conf in /etc/asterisk. Just below the [from-internal-custom] line at the top of the file, insert the following code:

    custom.conf is misspelled – Just FYI for your posting

    [WM: Fixed. Thanks.]

  2. MUCH appreciated! I was wondering why camp-on was absent in Asterisk when Vonage had it back in the mid 2000s. A local Italian restaurant / pizza shop here is difficult to reach in normal times, even moreso now with it being one of the few places open. It took me over 15 minutes and lord-only-knows how many presses of the Redial button to get through to them last week. And yes, my CDR log has pages of the redials.

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