[asterisk-users] Random DTMF Tones Only on heard on ATA

[Travis Langhals]

I have a couple of Linksys PAP2T-NA & Grandstream HT-502 extensions that are
receiving random DTMF tones on their side, but that are not heard by the
outside party.  I have been using Asterisk 1.6.6 through 1.6.10 and have
always had this issue.  I am only using SIP on the Asterisk server and all
extensions and trunks are set to rfc2833; outside of this issue DTMF
operation works fine.  I've included the Asterisk DTMF debug lines during
an occurrence of this issue for extension 5211.  The debug lines
seem similar to a normal DTMF event with exception of the "...but want
minimum 80..." message.  Any ideas?

[2010-07-27 10:34:42] DTMF[9744] channel.c: DTMF begin '1' received on
SIP/5211-00000078
[2010-07-27 10:34:42] DTMF[9744] channel.c: DTMF begin passthrough '1' on
SIP/5211-00000078
[2010-07-27 10:34:42] DTMF[9744] channel.c: DTMF end '1' received on
SIP/5211-00000078, duration 39 ms
[2010-07-27 10:34:42] DTMF[9744] channel.c: DTMF end accepted with begin '1'
on SIP/5211-00000078
[2010-07-27 10:34:42] DTMF[9744] channel.c: DTMF end '1' has duration 39 but
want minimum 80, emulating on SIP/5211-00000078
[2010-07-27 10:34:42] DTMF[9744] channel.c: DTMF end emulation of '1' queued
on SIP/5211-00000078
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