Of the three popular packet/cell technologies (Frame Relay, IP and ATM), Frame Relay is the most widely deployed. Frame Relay is commonly used in corporate data networks due to its flexible bandwidth, widespread accessibility, support of a diverse traffic mix and technological maturity.
Frame Relay service is based on Permanent Virtual Connections (PVCs). Frame Relay is the most appropriate technology for the Call Centre / BPO industry as it combines highly efficient bandwidth utilization with predictable performance.
Voice Frame Relay access devices (VFRADs), such as Nortel Passport series and Nuera Orca GX and F series integrate voice into the data network, and the Predictive Dialer / PBX / ACD at each site in the BPO network to the Frame Relay network running over dedicated IPLCs.
All VFRADs, such as Nortel Passport series and Nuera GX and F series employ sophisticated techniques to overcome the limitations of transporting voice over the Frame Relay network without the need to add costly bandwidth.These techniques are discussed below for Frame Relay. Implementation for IP and ATM is discussed in the Voice over IP (VoIP) and Voice over ATM (VoATM) sections, respectively.