should be a button marked ICM (intercom)

ext numbers start at 10

so ICM 10 will get you ext 10, 11,11 ETC ETC

ring or voice sets weather the icm call will ring the ext or come across hands free

the system isnt THAT old , productions stopped around 2000 as I recall still a lot of them out there


Skip
------------------------------------

Serving SW and West central Fl since 1984