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. _Yehavi: 2012/4/25 Bernard Murphy <bernard.david.murphy@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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