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DTMF from CME to SIP via SIP GW

Hi All

I have a DTMF problem from a number of CME's to our SIP Service Provider, basically our SP does not see the DTMF digits.  When I do a debug from a CME I see the digits being passed.  The Voice call is sent to a our SP via a Cisco 3845 which is acting as a GW to the SIP environment.  When I do a debug on our GW Router I do not see the digits, but I'm not sure if I should as the Voice is set to Flow-Through.  I've tried every DTMF relay setup between the CME and the GW Router to no avail.

Updated

i got our SIP SP to add G711 on their side and now it works.  Does DTMF on Cisco IP Phones only work if the codec is g711.

Thanks

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