Use H.323 trunks to implement Best Service Routing (BSR). This is an optional procedure. You can use H.323 trunks for polling, or for both polling and interflow. The additional network traffic is insignificant because polling requires only a small amount of data exchange. However, interflow requires a significant amount of bandwidth to carry the voice data. Depending on the other uses of the LAN or WAN and its overall utilization rate, voice quality could be degraded to unacceptable levels.

If H.323 trunks are used for BSR interflow, the traffic must be routed to a low-occupancy or unshared LAN WAN segment. You might also want to route internal interflow traffic, which has lower quality-of-service requirements, over H.323 trunks. You can route customer interflow traffic over circuit-switched tie trunks.