TELECOM Digest Editor noted in response to the original query:
>> [TELECOM Digest Editor's Note: I can tell this much; no one,but no
>> one tampers with or tries to rewire the inside of a 1A2 phone. The
>> wiring is just too complex. All the rewiring is done in the box on
>> the wall where there is room to move your arms and fingers, _not_
>> in the phone itself. PAT]
> No doubt. No one ever changed the wiring within a 1A2 or 10A2 set, with
> the expection of installing a buzzer for intercom. But, that wasn't
> really rewiring; rather loosing a couple of screws to overlap
> u-connectors.
> And, no one in the field re-wired a 1A2/10A2 KSU, other than to
> restrap the tie down wiring to change features, etc.
> Ain't computers great?!
> TELECOM Digest Editor's Note: I really do not think anything much can
> be done inside those phones without a lot of grief that cannot be done
> better and quicker at the punchdown block on the wall. I've done
> 'stuff' inside those phones but mainly things like remove or
> re-arrange the ball-bearings under the push buttons so I could get two
> or more buttons to stay down at one time. And once I converted a five-
> line six-button phone with a hold button into a three line phone with
> three associated hold buttons by using two of the line strips for each
> line, so that three buttons merely put a short on each of the
> associated three lines, and re-arranging the ball-bearings as
> needed. This was circa 1975. It was not a fun project. That was the
> day I vowed never to take one of those 1A2 phones apart again. PAT]
At least you could modify a 2565 or 565 type set. Modifying a 7406, 8410 or 6408 is almost completely out of the question.
I note the OP is a fan of modern phone system, as am I. But there is one tiny little problem.
Our PRI between our two switches regularly goes down for anywhere from
30 seconds to 5 minutes. This seems to occur most between 8:30AM and 9:00AM and then again between 2:00PM and 2:30PM. Verizon claims they can't figure it out. [TELECOM Digest Editor's Note: In that case, next month when it is time to pay the bill is tell Verizon "I can't figure out where I left my purse and money." PAT]