i beleive i have the DID programing corect but the carrier is seeing the call hit my pbx. How-ever the call isn't completed - fast busy?

Here's what i have so far

my incoming number is 212-555-4020
Im recieveing 4 Digits from the carrier..

22-09 : Dial-In Basic Data Setup
4 digits
sub-address mode - DID conversion Table

22-11 : Dial-in Conversion Table Data Setup
the recieved and target nunmber are both set to
4020

Is there another program that needs to be tweaked.