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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Technical Support
http://www.cellroute.net
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