Trying to program a port on an ip 500 that is connected to a Bogden TAMB2 then to a Bodgen amp. When I set the port to paging port I can not dial the port I get call rejected or some failed message on the LCD. If I program it as a standard telephone it works but 4 out or 5 times when intercoming the port I get ringing instead of going right to intercom, What am I doing wrong?