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Actually, I called the Viking people and they said that the "Line In" is ONLY used for a single line telephone and NOT when you have a phone system. That is why there is only one line from the "Phones" connection which is supposed to be plugged into the CAT 5E somehow.

In fact, I recall that the prior owner did have a laptop hooked up to line 5 to track his incoming calls, etc. You are absolutely right.
I guess I do NOT have a 5th line.
Given that, which slot should I hook the Viking "phones" line into?
(The whole system may not have to be programmed, since it worked before I unplugged everything.)

Do you actually have a doorphone? Can you tell us how you actually used the system to open a door before you disconnected it?

It's not a doorphone, but an intercom with a button that, when pushed, would ring into the phone system allowing for a conversation. (There is an intercom both at the front door and the front gate.) Then someone would go down and let the person in or use a remote control to open the gate.

Also, I'll happily trade a "room" for a "service call".

On one of your photos (#2) of the patch panel there is one port, port 21, marked "Door" with a line cord plugged into it. Where is the other end of that line cord?

I have tried connecting the cord to the Viking, both in "Line In" and "Phone". Neither works.

As I said before, the Viking tech said the "Line In" should not be used with a phone system, only the "Phones" outlet. But I've tried a line cord from the Viking "Phones" outlet to slots 37-47 with no success.

There is a ringing at both Viking intercoms (door and gate) when the buttons are pressed; it just doesn't ring into the phone system.

Adding more photos... (same location)

As to ports mentioned earlier... I think 12 belongs to the guest room (which has no phone in it) and 13 used to belong to a DSS line which was in the prior owner's office, but that office is now the dining room.

Which ports are the trunks? 43-47?
What are 37-40 considered?
FYI 37 connects to 44, and 38 connects to 45 (44 & 45 being the only two phone lines I have with Qwest. The prior owner had 4 active phone lines.)

I connected 46 & 47 to 39 & 40, respectively, even though they are not live phone lines, in case they somehow needed to be connected to "complete a circuit." If not, I guess they are not necessary.