You can get special multizone external paging equipment, but sounds like you intend to use 2 normal amps. You would need 2 UPAM's and 2 station ports. BUT - if you're willing to fight with it a bit you can forgo the UPAM's and hook straight to the station ports, depending on the paging equipment you intend to use. I've always have sucess with Bogen 100amp amplifiers, had some other ones not work. The main thing is to connect your test-set in parallell to the paging input and station port, go offhook and stay offhook through an IPO reboot. If successfull you should hear a short tone on your testset, you can then hang up and disconnect the testset.