User's Manual 36. Routing SBC
Version 6.8 565 Mediant 500L MSBR
The IP-to-IP Routing table also provides the following features:
Alternative routing or load balancing: In addition to the alternative routing/load
balancing provided by the Proxy Set associated with the destination IP Group, the
table allows the configuration of alternative routes whereby if a route fails, the next
adjacent (below) rule in the table that is configured as 'Alt Route Ignore/Consider
Inputs' are used. The alternative routes rules can be set to enforce the input matching
criteria or to ignore any matching criteria. Alternative routing occurs upon one of the
following conditions:
• A request sent by the device is responded with one of the following:
♦ SIP response code (i.e., 4xx, 5xx, and 6xx SIP responses) configured in the
SBC Alternative Routing Reasons table (see ''Configuring SIP Response
Codes for Alternative Routing Reasons'' on page 573).
♦ SIP 408 Timeout or no response (after timeout).
• The DNS resolution includes IP addresses that the device has yet to try (for the
current call).
Messages are re-routed with the same SIP Call-ID and CSeq header fields (increased
by 1).
Re-routing of SIP requests: This table enables you to configure "re-routing" rules of
requests (e.g., INVITEs) that the device sends upon receipt of SIP 3xx responses or
REFER messages. These rules are configured for destinations that do not support
receipt of 3xx or REFER and where the device handles the requests locally (instead of
forwarding the 3xx or REFER to the destination).
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