Edge Server placement is critical in a deployment to optimize media paths. The SIP signaling used for presence and IM is more tolerant of slight delays, but web conferencing and A/V traffic are sensitive to latency, so it is important to properly plan Edge Server placement.
As a rule of thumb, Edge Servers are generally deployed in any location with a Front-End pool that supports remote conferencing or A/V features.
For example, consider a small deployment for Company ABC, as shown in Figure 27.1 where a single Front-End Server in San Francisco exists. In this deployment, only a single Edge Server is necessary to support all the remote features. Media paths are all local to San Francisco.