AudioCodes Mediant 2000 User Manual page 191

SIP User's Manual
Typically, an SRD is defined per group of SIP UAs (e.g., proxies, IP phones, application
servers, gateways, and softswitches) that communicate with each other. This provides
these entities with VoIP services that reside on the same Layer-3 network (must be able to
communicate without traversing NAT devices and must not have overlapping IP
addresses).
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Figure 14-3: Configuring SRDs and Assignment
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14. Control Network
November 2011