[Freeswitch-users] fyi - DTMF with FlowRoute

Justin Grow jgrow at flowroute.com
Mon Jan 25 22:50:29 MSK 2016

I'm curious how we are handling the multiple sample rates offered for DTMF. If
you can open up a ticket at support.flowroute.com, and run a few test calls for
us to capture, we'll get to the bottom of it.

On Mon, Jan 25, 2016 at 11:31 AM Nathan Neulinger <nneul at mst.edu> wrote:
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

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Justin Grow Operations +1.206.641.8038
jgrow at flowroute.com
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