Asking for your help please to program NEC 2400imx? Need to know how to set up the 2400 for handshake with new VoIP gear via a "TIE" installed between open T-1 Port on the NEC PBX and open T-1 port on the new VoIP gear. This connection will allow us to provide seamless extension to extension and v/m retrieval by end users of either system during this trial period. Your thoughts and comments welcome! Thank you in advance....