Sorry about not including the version. The version of freeswitch I am using is. FreeSWITCH Version 1.0.head (git-256a82d 2011-01-31 10-12-28 -0600) I just updated to the latest yesterday to re-test it. On Tue, Feb 1, 2011 at 10:10 AM, Matt Stockton <mstockton@harqen.com> wrote:
I have having trouble with both missing and duplicated DTMF in Freeswitch.
Here are the steps of how I am using it:
1. Leg A - I am calling out from my Freeswitch instance (through iCall), and I am calling an iCall number that is also connected to the same Freeswitch instance.
2. Leg B - The above call is routed through iCall and then answered by the same Freeswitch instance.
3. On Leg B, I play a file and attempt to get DTMF in a lua script. Here is the code of interest:
callPin = session:playAndGetDigits(1, 10, 4, 30000, "#","/tmp/cw_17.wav", "", "\\d+");
4. On Leg A, I send DTMF information in a lua script. Here is the code of interest. I initiate a delay between each digit:
local newPin = "";
for i = 1, string.len(pin) do
newPin = newPin .. string.sub(pin, i, i) .. "W";
end
session:execute("send_dtmf", newPin .. "#@200");
** Note that there is a session:sleep on Leg A before I send the DTMF to make sure i don't send it too early **
The problem is that the recognized DTMF on Leg B is wrong about 30% of the time. For example, if Leg A enters: 22063083, Leg B will get the DTMF digits 222063083. This is an example of duplication, but I have also experienced missing DTMF codes (and an occasional wrong code completely)
I have messed with a bunch of DTMF settings in hopes of fixing this issue, but I cannot seem to find something that is reliable 100% of the time.
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Here are the DTMF settings I have looked at / messed with. I've tried various values for the dtmf-duration in the config (and in the send_dtmf command above)
<!-- This is in external.xml -->
<param name="dtmf-duration" value="500"/>
<param name="dtmf-type" value="rfc2833"/>
<param name="inbound-codec-prefs" value="$${global_codec_prefs}"/>
<param name="outbound-codec-prefs" value="$${outbound_codec_prefs}"/> <param name="inbound-codec-negotiation" value="greedy"/>
<!-- This is in vars.xml --> <X-PRE-PROCESS cmd="set" data="global_codec_prefs=PCMU"/> <X-PRE-PROCESS cmd="set" data="outbound_codec_prefs=PCMU"/>
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I have run fs_cli with event logging and the DTMF events that Freeswitch gets do correlate to the wrong value (e.g. the duplication / missing digits is noticable in the Freeswitch events as well).
Also, I am not running any dtmf-related applications on the session before I give control to the lua scripts (e.g. not running start_dtmf)
Has anyone experienced this type of issue? Or know what I can do to resolve it? My next step was going to be trying this against another provider besides iCall, but I figured I would see if anyone has encountered a similar problem before. Any help is appreciated.
Thanks