[asterisk-users] Duplicated DTMF issues

[James Lamanna]

Hi,
I have a 1.8.22 Asterisk (Box A) connected to a 1.4.32 Asterisk box (Box B)
through SIP.
The 1.4.32 box is then connected to the PSTN through PRIs.
I've noticed there are occasions where I am seeing duplicated DTMF.
I've verified from the SIP trace from the phone that there is only a single
'3' being pressed.
It appears as though the DTMF end (without a begin) that is detected on Box
B is being turned into a duplicate '3'.
Does anyone have an idea how to fix this? Do I need to lower the requested
DTMF duration?

Thanks.

-- James

This is what the DTMF logs look like.

Log on Box A (from phone):

[Jul  3 13:56:24] DTMF[30040] channel.c: DTMF begin '3' received on
SIP/3401-00034777
[Jul  3 13:56:24] DTMF[30040] channel.c: DTMF begin passthrough '3' on
SIP/3401-00034777
[Jul  3 13:56:24] DTMF[30040] channel.c: DTMF end '3' received on
SIP/3401-00034777, duration 90 ms
[Jul  3 13:56:24] DTMF[30040] channel.c: DTMF end accepted with begin '3'
on SIP/3401-00034777
[Jul  3 13:56:24] DTMF[30040] channel.c: DTMF end '3' detected to have
actual duration 77 on the wire, emulation will be triggered on
SIP/3401-00034777
[Jul  3 13:56:24] DTMF[30040] channel.c: DTMF end '3' has duration 77 but
want minimum 80, emulating on SIP/3401-00034777
[Jul  3 13:56:24] DTMF[30040] channel.c: DTMF end emulation of '3' queued
on SIP/3401-00034777

Log on Box B (from Box A):

[Jul  3 13:56:24] DTMF[14562] channel.c: DTMF end '3' received on
SIP/dp-pbx0-00022756, duration 0 ms
[Jul  3 13:56:24] DTMF[14562] channel.c: DTMF begin emulation of '3' with
duration 100 queued on SIP/dp-pbx0-00022756
[Jul  3 13:56:24] DTMF[14562] channel.c: DTMF end emulation of '3' queued
on SIP/dp-pbx0-00022756

Log on Box B (from PSTN):
[Jul  3 13:56:24] DTMF[14568] channel.c: DTMF begin '3' received on Zap/41-1
[Jul  3 13:56:24] DTMF[14568] channel.c: DTMF begin passthrough '3' on
Zap/41-1
[Jul  3 13:56:24] DTMF[14568] channel.c: DTMF end '3' received on Zap/41-1,
duration 172 ms
[Jul  3 13:56:24] DTMF[14568] channel.c: DTMF end accepted with begin '3'
on Zap/41-1
[Jul  3 13:56:24] DTMF[14568] channel.c: DTMF end passthrough '3' on
Zap/41-1
[Jul  3 13:56:24] DTMF[14568] channel.c: DTMF begin '3' received on Zap/41-1
[Jul  3 13:56:24] DTMF[14568] channel.c: DTMF begin passthrough '3' on
Zap/41-1
[Jul  3 13:56:24] DTMF[14568] channel.c: DTMF end '3' received on Zap/41-1,
duration 172 ms
[Jul  3 13:56:24] DTMF[14568] channel.c: DTMF end accepted with begin '3'
on Zap/41-1
[Jul  3 13:56:24] DTMF[14568] channel.c: DTMF end passthrough '3' on
Zap/41-1
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