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Cap keys are just like loop keys, but they are numbered & are not normally duplicated on phones. The sv8100 has a multiple assignment feature that makes them easier.

CAP keys will not let you direct select the key and make an outgoing call via ars like the loop key will.

You can set the loop key as:
1-Outgoing Only
2- Inbound Only
3- Bothways

CAP keys were a direct result of the old Electr-pro series of having more CO lines available then ther was buttons available on the sets.
Also starting with the old 8/24 and on up they did not have a dedicated intercom/call key.


DJ

If I remeber correctly, the UX5000 also has the option of CAP and CAR keys.....
WTH didn't NEC incorporate the built in CALL 1 and CALL 2 keys and let the IPK guys use the CAP key if they wanted to ?

I never had any problems with cap key's they work fine. I don't see the advantage of "Loop Keys" when they do the exact same thing.If you want to have Direct select, why not just make it a Square key System? You pick up Your Hand Set Press a Line Key or Pick up the hand set and Press 9, I've been using cap keys since the EPII, I think they serve their perpose.
Just my 2 cents

I agree with Rickman, the CAR and CAP keys work great,,,when you understand their operation. I have had several techs from the Toshiba or Nortel side of things that just can't get it.

This will be an ongoing deal forever about CAP CAR and Loop keys.

I understand completely about both having done NEC equipment since 1978 and they do have both there places, but if you upgrade or replace a "Square" Key system with lets say 10 or more lines and and go to a PRI and the customers are adamant about not having to dial "9" for an outside line then CAP keys are out.

DJ

CAP keys make zero sense in the PBX world... The UX has 2 loop appearances already on the phone (built in..require NO keys) AND you don't need an intercom keys. Sorry, but the CAP keys are just weird, and their limitations are silly. I work on have a dozen large systems and have never seen something as silly as CAP keys.

Agree with Coral Tech completely..

You can have CAP keys and PRI and not have to dial 9

Are you meaning have a Trunk Group key as well as a couple of CAP keys??