SIP User's Manual 474 Document #: LTRT-12801
MP-500 MSBG
11. Configure port forwarding so that the device's Data interface forwards SIP signaling
packets from the Internet (hosted IP-PBX or WAN) directly to the VoIP entity (i.e., on
the LAN interface), and vice versa in the 'Port Forwarding' page (Configuration tab >
Data Settings menu > Firewall submenu > Port Forwarding), as shown below:
Figure 9-21: Configuring Port Forwarding for SIP Signaling
12. Configure static NAT so that the NAT translates the Layer 3 source IP address of
packets received from the Voice entity to the device's WAN IP address for the
configured ports used by the SBC application, in the 'NAT' page (Configuration tab >
Data Settings menu > Firewall submenu > NAT), as shown below:
Figure 9-22: Configuring Static NAT
9.2.5.1 Survivability and Alternative Routing
The example in this subsection enhances the configuration described in ''SBC
Configuration Example'' on page 468 to include the SBC survivability feature. The
survivability feature ensures the continuity (survivability) of calls even if the Proxy serv
er
(e.g., IP PBX) does not respond. In normal operation, the IP PBX serves the Enterprise's IP
Phones, and calls are therefore, routed to the IP PBX.
The survivability feature provides the following survivability mechanisms:
îš„ If the IP PBX does not respond, the SBC application ensures that calls between IP
Phones within the Enterprise LAN are maintained.
îš„ If the called destination is not a registered user, the calls are routed to the PSTN.
The example described in this subsection is based on the previous example, but requires
the the following additional settings:
îš„ Define a SIP Interface for the device ("GW/IP2IP" application) located on the LAN
SRD.
îš„ Enable keep-alive for the Proxy Set (#ID 1) pertaining to the IP PBX IP Group.
îš„ Define classification by Proxy Set for the IP PBX IP Group (already defined in ''SBC
Configuration Example'' on page 468).
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