Bandwidth control The gatekeeper is responsible for monitoring and
controlling the network bandwidth being used by all calls.You can
restrict the amount of bandwidth used by voice and video (H.323) calls.
This is very important because if more calls are placed than the network
can support, all calls will suffer from poor quality. For example, the gatekeeper
actively monitors all calls, the bandwidth used by each call (bandwidth
requested at setup) and the call signaling between endpoints.The
gatekeeper uses this information to prevent the total bandwidth used by
voice and video calls to exceed the configured limit for a zone.This
assures that all allowed calls receive sufficient bandwidth.Thus the gatekeeper
can reject calls if a threshold for H.323 traffic has already been
met. In a traditional voice network the channels available on the wide
area network (WAN) would limit the number of calls that could be
placed. In an IP network, this limit does not exist—thus the gatekeeper
must apply this limit.