[Freeswitch-users] DTMF on BLeg not recognized by Cisco Gateway

Yehavi Bourvine yehavi.bourvine at gmail.com
Thu Apr 26 09:24:36 MSD 2012

Cisco is problematic with DTMF. Try using INFO instead of RFC-2833. You
even might need different encoding in each direction...

I tried finding the right config with Cisco's support and failed. I had to
replace the Cisco gateway with Audiocodes.


2012/4/25 Bernard Murphy <bernard.david.murphy at gmail.com>

> I have Freeswicth with a trunk to a Cisco SIP-ISDN gateway and am making a
> call from a SIP device to an IVR out on the PSTN, i.e. SIP -> FREESWITCH ->
> CISCO ->PSTN.  The Codec is PCMU throughout and while the call succeeds and
> Freeswitch recognizes the DTMF and appears to generate tones in the Bleg
> but they do not seem to be acceptable to the Cisco Gateway. The same call
> without freeswitch in the middle i.e SIP -> CISCO -> PSTN works absolutely
> fine.
> I have already tried <action application="set"
> data="rtp_manual_rtp_bugs=cisco_skip_mark_bit_2833"/> to no avail
> A freeswitch log and wireshark trace are attached. Can anyone spot why
> this is the case ?
> I already admit that this is Freeswitch version 1.0.6 (rather old) and the
> reason for that is that SIP Notify for MWI indication doesn't work with an
> Avaya 9630 on anything later but do not have time to fix that right now.
> Thanks in advance.
> Murph
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