Polycom IP550 and Polycom IP650 phones
Bootrom: 4.2.0.0310
Firmware: 3.1.3.0439
sipXecs: 4.0.4
Phones are on the same subnet as the sipXecs server. Calls are placed through
a SIP Trunk via an ITSP.
The ITSP "is a CLEC with Class 4/5 switches (i.e. we can provide dial-tone just
like the LEC).
We don't interface at the FXO/FXS level, we have many hundreds of DS3 level
SS7 trunks into the PSTN."
Wireshark traces taken outside the firewall show normal looking DTMF packets
(to the best that I can tell)
I've obfuscated the IP addresses in the trace. 192.168.1.1 is us, and
172.16.1.1 is the ITSP.
No. Time Source Destination Protocol Info
177 12:44:07.305097 192.168.1.1 172.16.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0x61520DE1, Seq=44802, Time=3427727744
178 12:44:07.321504 172.16.1.1 192.168.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0xB7FD9F32, Seq=1449, Time=1042988751
179 12:44:07.324745 192.168.1.1 172.16.1.1 RTP EVENT
Payload type=RTP Event, DTMF Nine 9
180 12:44:07.341535 172.16.1.1 192.168.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0xB7FD9F32, Seq=1450, Time=1042988911
181 12:44:07.344742 192.168.1.1 172.16.1.1 RTP EVENT
Payload type=RTP Event, DTMF Nine 9
182 12:44:07.361505 172.16.1.1 192.168.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0xB7FD9F32, Seq=1451, Time=1042989071
183 12:44:07.364797 192.168.1.1 172.16.1.1 RTP EVENT
Payload type=RTP Event, DTMF Nine 9
184 12:44:07.381571 172.16.1.1 192.168.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0xB7FD9F32, Seq=1452, Time=1042989231
185 12:44:07.384723 192.168.1.1 172.16.1.1 RTP EVENT
Payload type=RTP Event, DTMF Nine 9
186 12:44:07.401583 172.16.1.1 192.168.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0xB7FD9F32, Seq=1453, Time=1042989391
187 12:44:07.404729 192.168.1.1 172.16.1.1 RTP EVENT
Payload type=RTP Event, DTMF Nine 9
188 12:44:07.421565 172.16.1.1 192.168.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0xB7FD9F32, Seq=1454, Time=1042989551
189 12:44:07.424735 192.168.1.1 172.16.1.1 RTP EVENT
Payload type=RTP Event, DTMF Nine 9
190 12:44:07.445174 192.168.1.1 172.16.1.1 RTP EVENT
Payload type=RTP Event, DTMF Nine 9
191 12:44:07.450102 172.16.1.1 192.168.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0xB7FD9F32, Seq=1455, Time=1042989711
192 12:44:07.461546 172.16.1.1 192.168.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0xB7FD9F32, Seq=1456, Time=1042989871
193 12:44:07.464748 192.168.1.1 172.16.1.1 RTP EVENT
Payload type=RTP Event, DTMF Nine 9
194 12:44:07.481501 172.16.1.1 192.168.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0xB7FD9F32, Seq=1457, Time=1042990031
195 12:44:07.484732 192.168.1.1 172.16.1.1 RTP EVENT
Payload type=RTP Event, DTMF Nine 9
196 12:44:07.501554 172.16.1.1 192.168.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0xB7FD9F32, Seq=1458, Time=1042990191
197 12:44:07.504746 192.168.1.1 172.16.1.1 RTP EVENT
Payload type=RTP Event, DTMF Nine 9
198 12:44:07.521734 172.16.1.1 192.168.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0xB7FD9F32, Seq=1459, Time=1042990351
199 12:44:07.524742 192.168.1.1 172.16.1.1 RTP EVENT
Payload type=RTP Event, DTMF Nine 9
200 12:44:07.541784 172.16.1.1 192.168.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0xB7FD9F32, Seq=1460, Time=1042990511
201 12:44:07.544767 192.168.1.1 172.16.1.1 RTP EVENT
Payload type=RTP Event, DTMF Nine 9
202 12:44:07.561713 172.16.1.1 192.168.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0xB7FD9F32, Seq=1461, Time=1042990671
203 12:44:07.564786 192.168.1.1 172.16.1.1 RTP EVENT
Payload type=RTP Event, DTMF Nine 9
204 12:44:07.581647 172.16.1.1 192.168.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0xB7FD9F32, Seq=1462, Time=1042990831
205 12:44:07.584744 192.168.1.1 172.16.1.1 RTP EVENT
Payload type=RTP Event, DTMF Nine 9
206 12:44:07.599711 172.16.1.1 192.168.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0xB7FD9F32, Seq=1463, Time=1042990991
207 12:44:07.604724 192.168.1.1 172.16.1.1 RTP EVENT
Payload type=RTP Event, DTMF Nine 9 (end)
208 12:44:07.619888 172.16.1.1 192.168.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0xB7FD9F32, Seq=1464, Time=1042991151
209 12:44:07.624860 192.168.1.1 172.16.1.1 RTP EVENT
Payload type=RTP Event, DTMF Nine 9 (end)
210 12:44:07.639953 172.16.1.1 192.168.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0xB7FD9F32, Seq=1465, Time=1042991311
211 12:44:07.644716 192.168.1.1 172.16.1.1 RTP EVENT
Payload type=RTP Event, DTMF Nine 9 (end)
212 12:44:07.659935 172.16.1.1 192.168.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0xB7FD9F32, Seq=1466, Time=1042991471
213 12:44:07.665032 192.168.1.1 172.16.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0x61520DE1, Seq=44820, Time=3427730624, Mark
214 12:44:07.679882 172.16.1.1 192.168.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0xB7FD9F32, Seq=1467, Time=1042991631
215 12:44:07.684951 192.168.1.1 172.16.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0x61520DE1, Seq=44821, Time=3427730784
216 12:44:07.699905 172.16.1.1 192.168.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0xB7FD9F32, Seq=1468, Time=1042991791
217 12:44:07.704979 192.168.1.1 172.16.1.1 RTP
PT=ITU-T G.711 PCMU, SSRC=0x61520DE1, Seq=44822, Time=3427730944
Mike Burden
Lynk Systems, Inc
e-mail: [email protected]
Phone: 616-532-4985
-----Original Message-----
From: Scott Lawrence [mailto:[email protected]]
Sent: Tuesday, March 09, 2010 6:24 PM
To: Burden, Mike
Cc: [email protected]
Subject: Re: [sipx-users] DTMF Issues Revisited
On Tue, 2010-03-09 at 17:05 -0500, Burden, Mike wrote:
> OK, it looks like my understanding was way off base.
>
>
>
> On the advice of Dave D., Eric V. and Dave W., I’ve tried:
>
> - Locking the phones into G.711
>
> - Increasing the DTMF On/Off times from 50 to 150 (tested at 25ms
> increments)
>
> - Increased the DTMF level from -15db to -7db
>
> - Verified that RFC2833Control is enabled
>
> - Verified that ViaRTP is enabled
>
> - Verified that RFC2833Payload is set to 101
I've just gone back and looked through all of this thread and I don't
see any message in which you describe what the configuration is.
What phones are you using? What version?
What is your interface to the PSTN?
Is there anything between sipXecs and that PSTN interface?
Network debugging based on trial and error is rarely successful.
Trace the packets - looking at what is actually on the wire during your
experimental calls will isolate where your DTMF is being lost.
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