torontovoipnewuserx wrote:
So I guess TD Canda Trust must be using another (old ancient) way to receive DTMF singal
It's possible TD works with Inband DTMF and not RFC2833. I have no way of testing.
To test that theory, in the Grandstream ATA Web UI, you'd need to find the "Preferred DTMF Method" priorities found under the FXS Port tab.
"Preferred DTMF method
(in listed order):"
To test, Priority 1 should be "In-audio" for TD, and then, I guess, change "Priority 2" to "RFC2833" while testing. If that doesn't work, I would give up and revert settings to what they were.
Inband doesn't work with the G.729a audio codec because it's a very lossy codec, and I'm pretty sure Fongo's voicemail system doesn't work with Inband (or In-audio) DTMF. Inband doesn't work with Freephoneline's voicemail system.
Fongo Home Phone and Freephoneline support G.729a, but I always disable it because I hate the way it sounds. Anyway, for compatibility with G.729a, they use RFC2833.
I'm not sure whether changing Inband to priority 1 would prevent Fongo's voicemail from working.
When Inband is used, the touch tone is sent in the audio stream as was done with traditional POTS (plain old telephone service) or as how one could imagine playing back tones from a recording.
When RFC2833 is used, an RTP event is produced that signifies the DTMF key pressed by the user.
To bad Fongo Locks HT801. Otherwise I would like to log into the admin portal of HT801
I am sympathetic to this.
and find out what way it uses to process DTMF
I suspect priority 1 for Fongo Home Phone is RFC2833.