Version 6.4 363 March 2012
SIP User's Manual 18. GW and IP to IP
The device also supports the IP-to-IP call routing Survivability mode feature (refer to the
figure below) for USER IP Groups. The device records (in its database) REGISTER
messages sent by the clients of the USER IP Group. If communication with the Serving IP
Group (e.g., IP-PBX) fails, the USER IP Group enters into Survivability mode in which the
device uses its database for routing calls between the clients of the USER IP Group. The
RTP packets between the clients traverse through the device. When the Serving IP Group
is available again, the device returns to normal mode, sending INVITE and REGISTER
messages to the Serving IP Group.
Figure 18-46: IP-to-IP Routing for IP-PBX Remote Users in Survivability Mode (Example)
18.9.1.3 Inbound and Outbound IP Routing Rules
The device's IP-to-IP call routing is performed using the following two routing rule stages:
1. Inbound IP Routing Mapping Rule: Identifies the received call as an IP-to-IP call
based on various characteristics such as the call's source IP address, and assigns it to
an IP Group.
2. Outbound IP Routing Mapping Rule: Determines the destination (i.e., IP address) to
where the incoming call (classified to a specific IP Group by the Inbound IP Routing
rules) is finally routed. The destination address is typically depicted by another IP
Group (destination IP Group) and therefore, the call is sent to the IP address that is
defined in the Proxy Set associated with this IP Group. If the destination is a USER IP
Group, the device searches for a match between the request URI (of the received
INVITE) to an AOR registration record in the device's internal database. If a match is
found, the INVITE is sent to the IP address of the registered contact.
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