Looking for a PSTN DTMF echo test

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I’m having problems with DTMF on outgoing DAHDI. See

I’ve tested that the dtmf comes into * correctly. I know that it works
if I use SIP outbound. But it doesn’t work if I use DAHDI outbound.

I’d like to figure out what the called party on outbound DAHDI does
receive. Is there any PSTN number that echoes received DTMF tones? I’ve
found some dtmf echo tests for sip, but none on pstn.