rwarding) to most effectively carry a combination of voice and data Hunt Groups sessions without compromising voice quality. Because Frame Relay access is usually at data rates of 56/64 kbps, VoFR devices compliant with implementation agreement low bit-rate voice compression algorithms such as ITU are not required to negotiate operational parameters. G.723.1 and G.729A permit the greatest number of si- Negotiation procedures are for further study. Therefore, multaneous multiple calls while maintaining high-quality at the time of provisioning, the network manager must voice. Many vendors have implemented voice compres- configure end-to-end configuration parameters (e.g., Vo- sion algorithms in their Frame Relay access devices, and coder). End-point devices providing the VoFR service are can offer greater bandwidth savings, reduced network configured with compatible sub-channel assignments, congestion, and high-quality voice transmissions. signaling, compression algorithms, and other options. The relationship of the VoFR service, VoFR Service user, and Silence suppression on VoFR the frame relay service is shown in Figure 3.2-6. In a telephone conversation, only about 50 percent of the FRF. 11 enables vendors to develop standards-based full duplex connection is used at any given time. This is equipment and services that interoperate. It also enables because, generally, only one person talks while the other network managers seeking to reduce communications person listens. In addition, voice packets are not sent costs and maximize their frame relay network to consider during interword pauses and natural pauses in the con- VoFR as an option to standard voice services. In some versation, reducing the required bandwidth by another cases, users may find they have excess bandwidth in their 10 percent. Silence suppression frees this 60 percent of frame relay network that could efficiently support voice bandwidth on the full duplex link for other voice or data traffic. Other telecommunications managers may find transmission