Configuration Summary
Although there are several possible designs that achieve the required goals, this
would be a very effective solution. Reliability and load balancing would be
achieved by configuring two CallManager groups using different primary servers
in each as well as a shared backup server, and assigning half the IP phones to
each. Scalability is provided by spare capacity, and the ability to add servers to the
cluster. Using CallManager locations for remote sites would allow for tracking
and control of traffic over the WAN, and would be much less complex than using
several clusters.
Videoconferencing facilities are provided through the installation of MCUs.A
MCU at each remote site means that all intra-branch conference traffic will be
kept local. If conferences take place between sites, only the MCUs communicate
with each other, thus saving WAN bandwidth.The provision of two MCUs at
the central site will allow for up to 30 users within that site alone. See Figure 4.9
for the solution realization.