Send DTMF code to incoming call when entering the queue

I’m using FreePBX I have sip trunk, and an inbound route, which is directed to a queue. When there’s a call to the trunk, there’s a Music on hold, until an agent picks the call from the queue.
What I’d like to achieve is that when (or before) the call dropped to the queue the pbx would send a DTMF digit to the caller.
My knowledge of doing the configuration in the conf files is near to zero. I’m usually configure using the web UI of FreePBX.

Thanks for the help.

Update: The actual resolution was to make a sound file containing the DTMF frequency, and I’ve used this sound file as an announcement for the queue.

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