I have a question that I cant find a good solution for in regards to the Meridian CS1000. What I need to do as a temp solution for now is set up a key on one phone at the receptionist desk that when pressed will ring our security desk BUT the security desk will be able to hear what is going on while responding but the receptionist area wont be able to hear anything as to not tip off the "bad person". I have tried a few things via the manual that I thought might set this up for us but there's always two way communication so im either missing something or it maybe cant be done. Thank you for any help on this !