Installation Manual 42 Document #: LTRT-10205
Mediant 800 MSBG
3.2.1.4 Assigning WAN Interface to VoIP Network
Once you have defined the WAN IP address for the data-routing interface (in Section
3.2.1.3), you
need to associate it with VoIP traffic (i.e., SIP signaling and media / RTP
interfaces). The available WAN interfaces depend on the hardware configuration (i.e.,
Ethernet, T1, or SHDSL) and/or whether VLANs are defined for the WAN interface. If
VLANs are defined, then you can select the WAN VLAN on which you want to run the SIP
signaling and media interfaces.
Once this association is set, VoIP traffic is sent via the WAN and incoming traffic is
identified as coming from the WAN. The device also automatically configures the required
port forwarding and static NAT rules.
Note: If you do not assign the WAN interface to SIP and media interfaces, then the
WAN interface may not be used for VoIP traffic. In such cases, the VoIP traffic
can be sent and received within the LAN, or sent to the WAN via a third-party
LAN router. If a third-party router is used as the interface to the WAN, then
you need to define NAT rules (using the NATTranslation parameter) to
translate the VoIP LAN IP addresses (defined in the Multiple Interface table
and associated with SIP and media interfaces) into global, public IP
addresses.
¾ To assign a WAN interface to VoIP traffic:
1. Select the WAN interface:
a. Open the 'Multiple Interface Table' page (Configuration tab > VoIP menu >
Network submenu > IP Settings).
Figure 3-9: Selecting WAN Interface for VoIP Traffic in Multiple Interface Table Page
b. From the 'WAN Interface Name' drop-down list, select the WAN interface for VoIP
traffic.
c. Click Done, and then reset the device for your setting to take effect.
2. Assign the selected WAN interface to SIP signaling and RTP (media) interfaces. This
is done in the SIP Interface and SIP Media Realm tables respectively (whereby the
WAN interface is denoted as "WAN"):
d. Open the 'SIP Interface Table' page (Configuration tab > VoIP menu > Control
Network submenu > SIP Interface Table) and define SIP interface(s) on the
WAN interface.
Figure 3-10: Assigning WAN Interface to SIP Interface
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