07-04-2012 02:15 PM - edited 03-16-2019 12:01 PM
Hi friends!
Our company is developing a call recorder based on built-in-bridge technology. This recorder uses the DTMF (RFC-2833) signals from the telephones to activate some custom processing. We did all development using phone 7911 and CUCM 8.6 as a test base, getting awesome results.
However, we started testing other phones with BiB technology and got stuck at Phone 6921, because we couldn't find a way to make it send DTMF events ( both received and transmitted ) to the recorder.
When sniffing the network, after pressing some button on the keypad, we see this phone sending a SIP NOTIFY with DTMF data to the Call Manager, a RFC-2833 event to the far-end's RTP stream, but no RFC-2833 event to the recorder's RTP stream.
Is there some configuration we are missing out?? Is this a known bug or limitation??
Thanks in advance
07-04-2012 11:10 PM
Hi Sergio,
Please check this bug CSCua47105.
Hope this helps!
Thanks,
Karthik
07-05-2012 05:35 AM
Hey Karthik!
Phone is working with payload 101 already. We can see it sending RTPs with payload 101 to its far-end side. Only at the recorder call legs (far/near ends) they are not happening.
Here is the sequence of SIP messages within SDP negotiation, from the phone perspective, for the recorder's
near-end leg:
-> INVITE
v=0
o=CiscoSystemsCCM-SIP 4275 1 IN IP4 192.168.2.232
s=SIP Call
c=IN IP4 192.168.2.232
t=0 0
m=audio 4000 RTP/AVP 0
a=label:X-relay-nearend
a=rtpmap:0 PCMU/8000
a=ptime:20
a=inactive
<- 200 OK
v=0
o=Cisco-SIPUA 19606 0 IN IP4 192.168.2.75
s=SIP Call
t=0 0
m=audio 19134 RTP/AVP 0 101
c=IN IP4 192.168.2.75
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=inactive
-> INVITE (no SDP)
<- 200 OK
v=0
o=Cisco-SIPUA 19606 1 IN IP4 192.168.2.75
s=SIP Call
t=0 0
m=audio 19134 RTP/AVP 0 101
c=IN IP4 192.168.2.75
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sendrecv
-> ACK
v=0
o=CiscoSystemsCCM-SIP 4275 2 IN IP4 192.168.2.232
s=SIP Call
c=IN IP4 192.168.2.171
t=0 0
m=audio 40042 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=ptime:20
a=recvonly
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
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