IVR button presses are not working

When someone calls into our system they hear the IVR greeting.
It tells them to direct dial the extension or 1 for directory 2 for directions etc…
No matter what they press, nothing happens, the greeting keeps going & it never takes them to the destination.
My IVR module version is 13.0.27.10, all other modules are up-to-date.
Any suggestions?

Never mind, it was a Comcast ISP issue.
Fixed now

There are many Comcast users here, would you mind sharing what the issue and the fix was?
That can help someone in the future.

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