
Connecting Microsoft Lync 2013 to a SIP Trunk
AudioCodes Mediant E-SBC 40 Document #: LTRT-54004
4.3 Step 3: Configuring SRDs
This step shows how to configure Signaling Routing Domains (SRDs). An SRD is a set of
definitions comprising IP interfaces, E-SBC resources, SIP behaviors, and Media Realms.
4.3.1 Configuring Media Realms
A Media Realm represents a set of ports, associated with an IP interface, used by the
E-SBC to transmit or receive media (RTP or SRTP). Media Realms are associated with
SRDs or IP Groups.
Simplest is to configure one Media Realm for internal (LAN) traffic and another for external
(WAN) traffic as shown below, applied to the example scenario.
To configure Media Realms:
1. Open the Media Realm Table page (Configuration tab > VoIP > Media > Media
Realm Configuration).
2. Add a Media Realm for the LAN traffic:
a. Click Add.
b. Configure like this:
Parameter Example Setting
Index "1"
Media Realm Name "MRLan" (an arbitrary name)
IPv4 Interface Name
Voice (the interface name)
IPv6 Interface Name
IP6Voice (the interface name).
Note: Only applicable if using IPv6.
Port Range Start "6000" (a number representing the lowest UDP port
number to be used for media on the LAN)
Number of Media Session
Legs
"10" (the number of media sessions assigned with the
port range)
Figure 4-5: Configuring a LAN Media Realm
c. Click Submit.
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