Has anyone ever programmed a button on a phone (Yealink T42G & T46G) to direct access a specific line thru a Patton FXO Gateway ? I'm like to duplicate the method used for paging on the old Executone system I'm replacing. The old system was using an unused CO port to interface to the paging system. The 3CX system I'm installing uses a Patton gateway to access the customers POTS lines and I have a spare port available. Thanks for any advice!!