FS is in the media path of an IVR call.

At the moment, the call is ulaw with DTMF in the audio I think coming into FS and leaving FS.

The call is coming from an Asterisk server and going to an Asterisk server.

Is there a way to disable FS from passing DTMF at some point in the call? For example, after 15 seconds, is there a way to get FS to stop passing DTMF events?

Would I have to try to force asterisk to use rfc2833 when sending the call to FS and when accepting it back from FS?