About a month ago, we switched our PRIs from being run through a Nortel
Meridan system to an Asterisk based PSTN gateway using a TE210P card.
Since the cut over I have been getting reports of DTMF tones being heard
by my internal users when on calls to/from the PSTN.
I have confirmed via logging that the gateway machine is detecting what
it thinks is DTMF and regenerating it
I have relaxDTMF turned off.
Asterisk version 1.8.12.0 (also happened on 1.8.7)
Dahdi version 2.5.0
libpri version 1.4.12
Any suggestions?
A small sample from the logs.
[May 24 11:10:48] DTMF[8188] channel.c: DTMF begin 'D' received on
DAHDI/i1/NXXNXXXXXX-37e
[May 24 11:10:48] DTMF[8188] channel.c: DTMF begin passthrough 'D' on
DAHDI/i1/NXXNXXXXXX-37e
[May 24 11:10:48] DTMF[8188] channel.c: DTMF end 'D' received on
DAHDI/i1/NXXNXXXXXX-37e, duration 80 ms
[May 24 11:10:48] DTMF[8188] channel.c: DTMF end accepted with begin 'D'
on DAHDI/i1/NXXNXXXXXX-37e
[May 24 11:10:48] DTMF[8188] channel.c: DTMF end 'D' detected to have
actual duration 64 on the wire, emulation will be triggered on
DAHDI/i1/NXXNXXXXXX-37e
[May 24 11:10:48] DTMF[8188] channel.c: DTMF end 'D' has duration 64 but
want minimum 80, emulating on DAHDI/i1/NXXNXXXXXX-37e
[May 24 11:10:48] DTMF[8188] channel.c: DTMF end emulation of 'D' queued
on DAHDI/i1/NXXNXXXXXX-37e
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