But for your dial-peer voip, you should have the prefix of E.164 number that being assigned to PRI trunks. That's how the call will be routed to the PRI channel in the first place. If you don't have it, it means that you can only make outgoing call. You may use any priviate extention number in this case.
Here is one suggestion. Create a translation rule which matchs any number and then prefixes a digit on to that number (For example prefix a 9). You would then apply this translation rule to your incoming voip dial peer. Then all you would have to do is change your pots dial peer destination pattern to 9T. The 9 would get stripped before the number gets sent to the PSTN. Only caveat is that your incoming numbers can't start with the same digit otherwise you are back in the same boat.
Introduction: The "external-out enable" command is available for
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