I need to send Out-of-Band DTMF to an extension, but the snomone appears to transcode the DTMF to in-band. (The "extension" is really an IKON gateway which only supports out-of-band DTMF.) Here's a part of the logfile:
[6] 2013/09/10 13:19:40: Call port 121: Different Codecs (local telephone-event/8000, remote PCMA/8000), callid f419f99b@pbx, falling back to transcoding
[6] 2013/09/10 13:19:40: Received DTMF *, call type attendant
[8] 2013/09/10 13:19:40: Attendant: Ignoring the DTMF * in the state connected
How can I make the pbx forward the DTMF as an RTP-event to the "extension"?
In case it's relevant, here's the INVITE etc.
2013/9/10 13:19:39 Tx: udp:172.27.66.105:5067 (959 bytes)
INVITE sip:240@172.27.66.105:5067 SIP/2.0
Via: SIP/2.0/UDP 172.27.66.106:5060;branch=z9hG4bK-abb91ea6476deec2bab243dd796c1b78;rport
From: "Svalbard MER1" <sip:401@localhost;user=phone>;tag=51546
To: "MSG Control Room" <sip:240@localhost>
Call-ID: 57a2ef9c@pbx
CSeq: 27025 INVITE
Max-Forwards: 70
Contact: <sip:240@172.27.66.106:5060;transport=udp>
Supported: 100rel, replaces, norefersub
Allow-Events: refer
Allow: INVITE, ACK, CANCEL, BYE, REFER, PRACK, INFO, UPDATE
Accept: application/sdp
User-Agent: snomONE/5.1.0
Alert-Info: <http://127.0.0.1/Bellcore-dr3>
Content-Type: application/sdp
Content-Length: 329
v=0
o=- 63349 63349 IN IP4 172.27.66.106
s=-
c=IN IP4 172.27.66.106
t=0 0
m=audio 41036 RTP/AVP 8 0 9 2 3 101
a=rtpmap:8 PCMA/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:9 G722/8000
a=rtpmap:2 G726-32/8000
a=rtpmap:3 GSM/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=rtcp-xr:rcvr-rtt=all voip-metrics
a=sendrecv
and here's the OK back
2013/9/10 13:19:39 Rx: udp:172.27.66.105:5067 (820 bytes)
SIP/2.0 200 OK
Via: SIP/2.0/UDP 172.27.66.106:5060;branch=z9hG4bK-abb91ea6476deec2bab243dd796c1b78;rport
From: "Svalbard MER1" <sip:401@localhost;user=phone>;tag=51546
To: "MSG Control Room" <sip:240@localhost>;tag=802229
Call-ID: 57a2ef9c@pbx
CSeq: 27025 INVITE
Contact: <sip:240@172.27.66.105:5067>
Allow: REGISTER,SUBSCRIBE,NOTIFY,INVITE,ACK,PRACK,OPTIONS,BYE,CANCEL,REFER,INFO,UPDATE
Content-Length: 149
Content-Type: application/sdp
Server: (innovaphone H323/[unknown])
Supported: replaces,100rel,sec-agree,answermode
P-Preferred-Identity: <sip:240@172.27.66.105:5067>
Remote-Party-ID: <sip:240@172.27.66.105:5067>;party=called;screen=no;privacy=off
v=0
o=- 49 1 IN IP4 172.27.66.105
s=-
c=IN IP4 172.27.66.105
t=0 0
a=sendrecv
m=audio 8184 RTP/AVP 8 0
a=ptime:20
a=silenceSupp:off - - - -