Valcom has a 1 zone talkback paging unit .
MN V-9941A . It works off a CO port . If they are expecting anything close to duplex quaility with talkback paging they are in for a huge let down . Remember the loudest noise takes over the talkback control . So you might want to be upfront about this or you will be there forever adjusting the txmit/rxmit controls !
