NEC IP7WW-EXIFB-C1 System expansion daughter board/ VRS & InMail chan - BE116501

Using a Cat5 cable, EXIFB-C1 board mount onto the CPUC1 board is individually connected to each EXIFE-C1 board (on Expansion Chassis) – VRS/VM (InMail) channels expansion (Up to 16ch) – Additional 48 Telephony resources (DTMF/Dial tone/Busy tone/FSK caller-ID receiver/sender) – Support Analog Modem (V.34) 2.1.4 https://www.nec-enterprise.com/