DTMF tones

[usa2k]

Although rare, its too bad DTMF couldn't be outside the normal vocal range.

[burris]

Don't think it can be since DTMF has to be in the voice band in order to work..

[sommerfeld]

Although rare, its too bad DTMF couldn't be outside the normal vocal range.

The PSTN was engineered to carry just the normal vocal range; tones outside that range would be lost or mangled in transmission.

[dswartz]

So what I'm wondering is: if hearing certain voice patterns in the incoming audio stream can fake the ATA into think a DTMF tone was present, wouldn't you think configuring the channel for RFC2833 should prevent that? After all, if you are telling the ATA that the other end will send DTMF either via RFC2833 or SIP INFO, it shouldn't be looking in the audio stream for DTMF, no? Or am I missing something?

[dswartz]

Ah, my apologies then. Sounds like two different problems?

[voxabox]

I cannot believe it
My hearing impair works to my advantage
J/K, I do not think I've ever heard the DTMF tone with my SPA-1001
being a very old ATA, perhaps, it's impervious to the problem!?!

[mrkarron]

After making the suggested changes, I still hear the tone(s) calling the VOIPo line from a wireline. It seems to be related to the pitch of the voice as I only hear the tones while talking to my wife or daughter. When I am using the VOIPo line, the person on the other end, using a landline, never hears them. Could this also be related to inbound vs outbound calls?

[usa2k]

I would think you should only hear these erroneous tones outbound.
Inbound would be the sending equipment's job.