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