I'm going to give Valcom Tech Support a call to inquire about the button talkback. The Bogen solution also looks interesting. As you pointed out all TBs work together and that may present a problem. I'm thinking about talking with the customer to see if they would consider a one-way system and scatter a few extension phones around that they could use to answer a page call.
Thanks for all your help. If anyone has any other tricks I would appreciate them
