AudioCodes Mediant 4000 SBC User Manual page 332

Therefore, when employing a single-SRD configuration topology, there is no need to
handle SRD configuration (i.e., transparent).
SRDs are associated with the following configuration entities:

SIP Interface (mandatory) - see ''Configuring SIP Interfaces'' on page 341

IP Group (mandatory) - see ''Configuring IP Groups'' on page 349

Proxy Set (mandatory) - see ''Configuring Proxy Sets'' on page 363

Admission Control rule - see Configuring Admission Control Table on page 487

Classification rule - see Configuring Classification Rules on page 491
As mentioned previously, if you use only a single SRD, the device automatically assigns it
to the above-listed configuration entities.
As each SIP Interface defines a different Layer-3 network (see ''Configuring SIP Interfaces''
on page 341 for more information) on which to route or receive calls and as you can assign
multiple SIP Interfaces to the same SRD, for most deployment scenarios (even for multiple
Layer-3 network environments), you only need to employ a single SRD to represent your
VoIP network (Layer 5). For example, if your VoIP deployment consists of an Enterprise IP
PBX (LAN), a SIP Trunk (WAN), and far-end users (WAN), you would only need a single
SRD. The single SRD would be assigned to three different SIP Interfaces, where each SIP
Interface would represent a specific Layer-3 network (IP PBX, SIP Trunk, or far-end users)
in your environment. The following figure provides an example of such a deployment:
User's Manual
Figure 17-6: Deployment using a Single SRD
332
Mediant 4000 SBC
Document #: LTRT-40203