Have you had this experience? Any ideas how to fix?
No, my LINE Port works as expected.
If your PSTN line is inbound only and cannot be used for outgoing calls, then it makes sense to change the CallReturnDigitMaps as you did, since the result will be to have incoming calls from the LINE Port retuned via SP1 when *69 is used. If that's not the case, I don't understand the reason for the change.