Compare the values in the TRAF parameter for the route to which the external number is pointed, and the TRAF parameter for the category for the extension from which the external number is dialled.
If you use LCR, you'll need to compare the TOLL parameter for the external number entry (in whatever table it appears)and the TRAF parameter for the extension category. The bit in the TOLL parameter for the external number entry that matches the TCD value in TRAF for the extension must be set to "1" for the extension to dial the external number.
You may also need to verify that the extension and the route are allowed connection in the traffic matrix, but this is not likely the problem if the extension can dial other external numbers that traverse the same route.
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