Thanks for the suggestion. I have disconnected the line cord connecting the Valcom paging unit to the Page jack of the Partner and no change. I've also tried disconnecting the music input to the Valcom. I still get the error/restricted-access/warble tone when trying Intercom 70. I am at witts end and am about ready to default the thing and start all over. It is a pretty simple/small system. Any other words of wisdom? The customer is a grocery store and need the paging oftern.