Setup guide · 3 min read

How to set up TextbackFast with 3CX

Set 3CX's Available status to forward unanswered calls to your TextbackFast number as an external number.

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TextbackFast · 3CX setup
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In 3CX, each status has its own forwarding rules. Set the Available status to send unanswered calls to your TextbackFast number after the ring time you choose.

The numbers behind missed calls

37.8%of inbound calls answered by small businesses
42%of callers leave a voicemail when nobody answers
21%call another business right away

Sources: 411 Locals study; CallRail 2025 survey.

One in five callers who hit voicemail dials your competitor next. A text in seconds keeps them talking to you.Based on the CallRail 2025 survey

Steps

  1. Sign in to the 3CX Web Client.
  2. Go to Settings › Call Forwarding.
  3. Open Available.Set the number of seconds before an unanswered call is forwarded, about 20.
  4. Under unanswered calls, set forwarding for external calls to External number and enter your TextbackFast number.
  5. Do the same for busy or not registered, and for the Away and Do Not Disturb statuses if you want after-hours calls to get a text too.

The 3CX Web Client manual covers these Call Forwarding settings, including the no-answer seconds for Available (3CX Web Client manual).

Hear it for yourself

Call our demo line, let it ring, and get a text back in seconds.

Ring groups and queues

3CX extensions in the Available status do not follow their own forwarding rules for ring group or queue calls. For those, set the ring group or queue Destination if no answer to forward to an outside number, your TextbackFast number. An admin does this in the Admin Console.

Test it

  1. Call your business number from another phone and let it ring out, or decline the call.
  2. The caller should get your TextbackFast text within seconds.
  3. No text?Turn forwarding off, then set it up again carefully. One wrong digit is the most common problem.

Questions, answered.

Calls to my main number are not forwarded.

Your main number probably rings a ring group or queue. Set its Destination if no answer to your TextbackFast number.

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