Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
I will need to ask for clarification of the problem, if that's OK.
It seems to me, if I understand your question, that you have a phone system box (a Panasonic D1232) and one phone or one line has a line restriction, against calling out.
In other words, one phone cannot call outside, it can only be used as an intercom on the local phone system in the church.
Try swapping phone stations, to make sure it is not a matter of the phone station or handset. If the problem stays in the same place even when the phone station is swapped with a phone station on a different line, then it is presumably a matter of configuring the Panasonic D1232 to allow that line to call out.
(For such a reconfiguration, you would need to know the administrator password ***** the D1232... and to advise you, I would need to know the maker, and model #, of the phone station too.)
If the problem follows the phone station, when you swap the phone station with another one at a different desk or on another line, then you have a phone station that is either defective or configured to limit outside calling, and that phone station would need to be reconfigured... in which case, again, I would need to know the phone station's maker and model #, please. Thanks.