Am 28.09.2012 17:33, schrieb Joshua Colp:
Ok, good idea, here are the results of Read() and SayDigits():
<snipped results to make this email manageable>
How are you changing the DTMF for each provider? If you are merely
changing it using dtmfmode in sip.conf this may or may not change how
the provider side sends it. In the case of setting it to rfc2833 it
causes RFC2833 to be negotiated in the SDP. Some equipment MAY change to
using inband if it has not been negotiated.
Yes, only via dtmfmode in sip.conf. I have no control over the provider
side, of course. :) Or are there other options?
Essentially when doing conversion of inband DTMF to out of band DTMF it
is possible for some parts of tones to get through unmuted. You have to
strike a balance between detecting the DTMF early enough, not detecting
other stuff as DTMF, and muting it. Some implementations may let some
"leak" through. The only way to completely overcome that is to buffer
enough audio and delay the stream.
Ah! So because I'm calling from PSTN which is "naturally" inband (I
guess?) my DID provider (or rather some provider in front of him)
converts to out of band (RFC2833), but the conversion cannot be fully
accurate?
If I understand right, all my four DID providers are "broken"?
If the provider is doing the conversion their equipment should mute the
inband DTMF as best it can and you should not hear it.
How much of the tone are you hearing?
About the tone itself: it's always different for each DTMF
method/provider I would say. Sometimes it's just a really short "glub"
(no idea how to describe that better), and sometimes it's a full-length
"beeep". But in any case except for provider 4 inband + INFO I'm hearing
all of it (123), so it's anything from glub-glub-glub to
beeep-beeep-beeep. :-)
Right now, after what you wrote, I'm left with the feeling that RFC2833
is pretty much, well, hmm... useless in a PSTN-VoIP scenario? It works
fine when using X-Lite, I suppose because there is no conversion
involved and therefore the tones can get completely muted.
I'm sad now. Is there nothing I can do to remove DTMF tones from my
conferences? :-(
Thank you!
Markus
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