cisco 3662, intercorporate pvc problem

I have a cisco 3662, and had at&t put in a intercorporate pvc with our pharmacy vendor, who uses an ascend router, and currently has (20) pvc's working... we can not get this to work at all... after being on the phone with at&t for 1.5 hrs, they said they (at&t) now can see connectivity and LMI between both, but neither of us are getting any traffic???

ideas???
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foadAsked:
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lrmooreCommented:
Do you have your frame encapsulation set to IETF?
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scraig84Commented:
Is your sub-interface in an "up-up" state?  Are you getting LMI?  Is you addressed correctly?
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geoffrynCommented:
What kind of clocking are you using on the interfaces?
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foadAuthor Commented:
lrmoore, you got it... finally had our vendor get on the phone with cisco, and that's what it was... the pvc was setup as if the other side was a cisco router, which it was not. So it HAS to be IETF, once that was switched... whamo it started to fly...

thanks everyone for the quick response....
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