[Asterisk-Users] Asterisk - no outband DTMF with Mediatrix

[Arek Bekiersz]

Dear List members,



I have this problem with Mediatrix 24-FXS-line gateway and out-of-band DTMF.
It seems not working - the RTP mode is not working and when I select INFO
mode, the Mediatrix is behaving just the same as with RTP mode.

Here is a bunch of logs to explain this:

1. The RTP out-of-band mode (dtmfmode=rfc2833):
This is OK reply from Asterisk to Mediatrix when RTP mode selected. Seems OK
;-):

[...]
SIP/2.0 200 OK
CSeq: 1091919829 INVITE

v=0
o=root 35059 35059 IN IP4 xxx
s=session
c=IN IP4 xxx
t=0 0
m=audio 12210 RTP/AVP 8 101
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
[...]

And then, during connection with asterisk, when we use DTMF, this shows on
debug:
[...]
May  3 17:49:42 NOTICE[139648000]: rtp.c:418 ast_rtp_read: Unknown RTP codec
96 received
May  3 17:49:42 NOTICE[139648000]: rtp.c:418 ast_rtp_read: Unknown RTP codec
96 received
[...]


2. INFO mode (dtmfmode=info):

Proper INVITE from Mediatrix:

[...]
INVITE sip:xxx at xxx:5060 SIP/2.0
CSeq: 1657017135 INVITE
Content-Type: application/sdp
Contact: Port 3 <sip:3349 at xxx>
Supported: replaces
User-Agent: MxSipApp/4.4.11.68 MxSF/v3.2.7.30

v=0
o=MxSIP 4563726510189014186 6429835688411497953 IN IP4 xxx
s=-
c=IN IP4 xxx
t=0 0
a=sendrecv
m=audio 5004 RTP/AVP 8 18 4 0 13 111
a=rtpmap:8 PCMA/8000
a=rtpmap:18 G729/8000
a=rtpmap:4 G723/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:111 X-nt-inforeq/8000
[...]

And then nothing happens, Asterisk shows no DTMF events.

Thanks for any help,
Arek Bekiersz