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Random DTMF Tones
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antigenius Offline
Junior Member

Posts: 2
Joined: Mar 2013
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Post: #4
RE: Random DTMF Tones
Test confirmed DTMF talk-off happened when we combine both Yealink phone and analog trunk together (with Sangoma card as interface).
Polycom doesn't seem to have the same problem under same situation.
then I successively make DTMF talk-off goes away by changing Yealink phone's DTMFmode=inband.
But then customer can't login their voice mail because asterisk will always reply "incorrect password" even the password is correct.

After one hour of searching i found this

"In some VoIP routes a switch may be configured to detect in-band DTMF which is sent by the VoIP ATA, but then switches to an out of band RFC2833 DTMF required for an upstream provider. This upstream carrier then terminates the call to the PSTN, possibly to a voice mail system, which will require regeneration of the audible inband DTMF tones. The switch has to detect and remove the tone sent by the ATA from the audio stream because the upstream provider specified RFC2833 DTMF. At times the switch can't always completely remove the in-band DTMF tone which is a problem, because by the time it has detected the DTMF tone, it has already passed a short amount of it. This small amount of in-band tone along with the RFC2833 tone sent are both received by the far end voice mail system which will then register an error (problem), possibly an invalid mailbox or invalid password."

It perfectly states my problem but there's no fix. Does anyone have any idea?
(This post was last modified: 03-21-2013 12:02 AM by antigenius.)
03-21-2013 12:00 AM
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Messages In This Thread
Random DTMF Tones - rloalbo - 01-24-2013, 04:16 AM
RE: Random DTMF Tones - Yealink Support - 02-01-2013, 08:31 PM
RE: Random DTMF Tones - antigenius - 03-18-2013, 02:44 PM
RE: Random DTMF Tones - Yealink Support - 04-17-2013, 03:22 PM
RE: Random DTMF Tones - antigenius - 03-21-2013 12:00 AM
RE: Random DTMF Tones - infonetics - 04-17-2013, 02:46 AM
RE: Random DTMF Tones - Yealink Support - 04-17-2013, 03:28 PM
RE: Random DTMF Tones - infonetics - 04-17-2013, 09:34 PM
RE: Random DTMF Tones - Yealink Support - 04-18-2013, 03:55 PM
RE: Random DTMF Tones - infonetics - 05-08-2013, 04:38 AM
RE: Random DTMF Tones - DavidAUM - 05-17-2013, 11:49 PM
RE: Random DTMF Tones - AlexG - 07-04-2013, 12:32 PM
RE: Random DTMF Tones - ccwtech - 08-01-2014, 11:44 AM
RE: Random DTMF Tones - fredolaz - 07-28-2015, 04:25 AM

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