Loop keys are for both in and out with dial 9 access I normally use two but you will need more if you want to make a large conf call. If any did number rings on more than one phone at one time you have to send the call to a station hunt group.

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"Old phone guys never die, they just get locked in some closet with an old phone system and forgotten about"

Retired, taking photographs and hoping to fly one of my many kites.