asterisk users - Jul 2004 - Touch Tones not working after call is made

I'm running the latest CVS of asterisk.

If I make a call to an automated attendant system that has a directory tree
(don't we all hate those),
I can't get my touch tones to be recognized at the far end.  In debug mode,
asterisk sees what key
is pressed, but the far end system doesn't recognize it.

Any ideas what to check?

This is MGCP channel.

Thanks
Duane Cox
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