Can't receive faxes.

[billsecond]

I have configured a working number (using Twilio) to accept Faxes using the send to Email option (extension). When I make a test call using my cell phone, it hangs up right away, and so do the test faxes that I make. I see that Twilio does send the call to the PBX, but then the PBX drops the call right away. I have clicked the Allow Incoming Faxes option on the phone number in Twilio. What am I doing wrong?

FYI: I am on the trial version for 3CX for what that is worth.

 

[cobaltit]

What you are doing wrong is you are using Twilio.

https://www.3cx.com/docs/twilio-elastic-sip-trunking/

Twilio doesn't support T38.

 

[leejor]

I see that Twilio does send the call to the PBX, but then the PBX drops the call right away.

And what is the failure indication in the 3CX Activity Log?