The high density Cisco VIC-4FXO-M1 Voice Interface Card (VIC) supports up to four Foreign eXchange Office (FXO) M1 analog trunk ports. The VIC-4FXO-M1 is built from industry-proven Cisco hardware and uses industry-proven Cisco IOS Software technology. Because the Cisco VIC-4FXO-M1 is the same size as the existing two port VICs, it can slide into either one of the two VWIC slots located on the MRP card. Thus, when installing two Cisco VIC-4FXO-M1 cards within a MRP, up to eight FXO-M1 trunk ports can be supported.