I'D LIKE TO CONNECT A VOICEMAIL SYSTEM THAT CAN BE CONFIGURED FOR ANALOG PORTS OR ISDN. UNFORTUNATELY IT DOESN'T SUPPORT SMDI SERIAL SIGNALING. I REMEMBER THAT PRIOR TO BC5, THE MD110 USED IN-BAND SIGNALING. IS THERE A WAY TO GET IN-BAND OR ISDN SIGNALING FOR VOICEMAIL IN BC9 OR LATER?