[Freeswitch-users] fyi - DTMF with FlowRoute

Nathan Neulinger nneul at mst.edu
Mon Jan 25 22:30:47 MSK 2016

I know this has been brought up previously in another thread, but wanted to mention I'm seeing it as well. However - I 
do have an additional data point.

This is the SDP being sent:

    o=FreeSWITCH 1453729420 1453729421 IN IP4 131.151.x.x
    c=IN IP4 131.151.x.x
    t=0 0
    m=audio 19222 RTP/AVP 102 103 9 0 8 104 106 101
    a=rtpmap:102 G7221/32000
    a=fmtp:102 bitrate=48000
    a=rtpmap:103 G7221/16000
    a=fmtp:103 bitrate=32000
    a=rtpmap:9 G722/8000
    a=rtpmap:0 PCMU/8000
    a=rtpmap:8 PCMA/8000
    a=rtpmap:104 telephone-event/32000
    a=fmtp:104 0-16
    a=rtpmap:106 telephone-event/16000
    a=fmtp:106 0-16
    a=rtpmap:101 telephone-event/8000
    a=fmtp:101 0-16

I realize that anything other than PCMU is pointless with flowroute. Symptom is seen on both 1.4 and 1.6.

Confirming what some others on the thread have said - forcing codec to PCMU (in my case via carrier_gateway lcr table), 
immediately corrects the issue. It seems like a definite bug on flowroute's side, and will be following up with that on 
the open case.

-- Nathan

Nathan Neulinger                       nneul at mst.edu
Missouri S&T Information Technology    (573) 612-1412
System Administrator - Architect

Join us at ClueCon 2016 Aug 8-12, 2016
More information about the FreeSWITCH-users mailing list