Hello,
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 receipients. 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 possibilty, but this hasn’t helped at all.
Can someone please point me in the right direction?
Thanks,
J
You can edit your logger.conf and enable DTMF logging, If you send it to the console you will see every time you receive DTMF from the PSTN.
I had a bad hardware DTMF decoder on one of my T1 cards, I ended up replacing the card because it would randomly give me 3000ms DTMF tones.
Hi,
Thanks for the reply.
The only thing is that both inbound and outbound calls are made over SIP - there is no physical PSTN hardware or lines at the site and the SIP provider’s network then passes the call off to the PSTN network. Would this have a bearing at all?
Hi,
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 sytem 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
The provider has suggested RFC2833 out-of-band, but the Cisco manuals do not clearly state which setting this is on the handsets.
Regards,
Jamie