[asterisk-users] DTMF issue

[Andres]

On 7/6/15 5:53 PM, Jamie Rees wrote:
>
> Hello folks,
>
> We have an issue with several Cisco SPA512G phones connected to an 
> Asterisk platform where several users hear loud, random beeps during 
> calls to external recipients. The noises are akin to button press 
> tones, are very loud and a significant annoyance.
>
> I've tried changing the DTMF tones on the phones (512G's running 
> firmware 7.5.5) from In-Band to every other possibility, but this 
> hasn't helped at all. The provider has suggested RFC2833 out-of-band, 
> but the Cisco manuals do not clearly state which setting this is on 
> the handsets.
>
> I have enabled DTMF logging and spoken to the SIP provider, but they 
> couldn't really help much. I presume the issue is local to our phone 
> system but other than the logs below, have nothing to go on:
>
> [2015-06-10 09:32:26] DTMF[3280][C-0000c5a1] channel.c: DTMF begin '2' 
> received on SIP/sip-out-00021c6d
> [2015-06-10 09:32:26] DTMF[3280][C-0000c5a1] channel.c: DTMF begin 
> passthrough '2' on SIP/sip-out-00021c6d
> [2015-06-10 09:32:26] DTMF[3280][C-0000c5a1] channel.c: DTMF end '2' 
> received on SIP/sip-out-00021c6d, duration 200 ms
> [2015-06-10 09:32:26] DTMF[3280][C-0000c5a1] channel.c: DTMF end 
> accepted with begin '2' on SIP/sip-out-00021c6d
> [2015-06-10 09:32:26] DTMF[3280][C-0000c5a1] channel.c: DTMF end 
> passthrough '2' on SIP/sip-out-00021c6d
> [2015-06-10 10:07:10] DTMF[5134][C-0000c5b6] channel.c: DTMF begin '3' 
> received on SIP/209-00021cac
> [2015-06-10 10:07:10] DTMF[5134][C-0000c5b6] channel.c: DTMF begin 
> passthrough '3' on SIP/209-00021cac
> [2015-06-10 10:07:10] DTMF[5134][C-0000c5b6] channel.c: DTMF end '3' 
> received on SIP/209-00021cac, duration 90 ms
> [2015-06-10 10:07:10] DTMF[5134][C-0000c5b6] channel.c: DTMF end 
> accepted with begin '3' on SIP/209-00021cac
> [2015-06-10 10:07:10] DTMF[5134][C-0000c5b6] channel.c: DTMF end '3' 
> detected to have actual duration 78 on the wire, emulation will be 
> triggered on SIP/209-00021cac
> [2015-06-10 10:07:10] DTMF[5134][C-0000c5b6] channel.c: DTMF end '3' 
> has duration 78 but want minimum 80, emulating on SIP/209-00021cac
> [2015-06-10 10:07:10] DTMF[5134][C-0000c5b6] channel.c: DTMF end 
> emulation of '3' queued on SIP/209-00021cac
>
> Can someone please provide any tips?
>
Yes, I have had this annoyance happen to me before.  It is very 
frustrating.   In order to rule out the SIP Provider, I suggest you 
record the call.  If the beep is not heard in the recording but only by 
the end user on the Cisco Phone, then its a phone issue.  The phone is 
confusing audio with the specific frequencies of DTMF. There is little 
you can do to fix this except for firmware upgrades (and I remember 
there were some that addressed this specific issue, at least on Cisco ATAs).
>
> Thanks,
>
> Jamie
>
>
>


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