A resteraunt is expanding and additional phones will be installed. I would assume, any key system such as this KX-TDA30, will have all the lines terminated to the bix punch down. Are these systems preset at the factory with given extentions set to per line comming out of the system? What keys on the phone will reveal the extention the phone belongs to?

Thanks

You are going to have to be sure that there is a station card to support the extra sets. Some systems are programmed as 101 102 etc. Panasonic just changed the set type to 500 series. If you are installing the T7667 press the transfer key will tell the extention number

Any phone call a display phone.