Call forward from land line to VOIP not accepting key presses

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So we have a number that's hosted on our PBX and a land line that we have call forwarded while we wait for the port. When someone calls through the land line number, key presses aren't recognized by the PBX. If we call the number that the call is forwarded to that's directly on the PBX, it works just fine.

Is there some sort of tweak that I could do to make it pickup the key presses from this ATT land line forward?
 
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