This is driving me nuts. 

I have a Cisco CME (a few actually) where I cannot get DTMF to work.

Does someone happen to have the magic recipe of SIP/Dialplan profiles and Cisco config to make DTMF <relay> work?

I spent several very very painful days trying to get RFC2833 to work, using FS to try and generate the tones itself. I ended up with all sorts of codec mismatches, delay,distortion and some really mangled DTMF tones…

So, now I'm back to;

PSTN----CiscoGW----<external>----FS----<internal>----<CUST PABX>---Phone

Where <CUST PABX> is 3 CMEs that won't talk DTMF

30+ other vendor's gateway's that WILL do DTMF…

Context External and internal are both set to dtmf-type info (or dtmf_type info) 

DTMF works FROM the Cisco GW towards our network, doesn't 

So, does anyone have a magic solution?

 Because Cisco TAC say they see DTMF being sent (as rtp-nte), when I need INFO or in-band.

Thanks,

Mike