SIP User's Manual 190 Document #: LTRT-12801
MP-500 MSBG
Parameter Description
Alternative Route Options
[IP2IPRouting_AltRouteOptions]
Determines whether this routing rule is the main routing rule
or an alternative routing rule (to the rule defined directly
above it in the table).
 [0] Route Row (default) = Main routing rule - the device
first attempts to route the call to this route if the incoming
INVITE's input characteristics matches this rule.
 [1] Alt Route Ignore Inputs = If the call cannot be routed
to the main route (Route Row), the call is routed to this
alternative route regardless of the incoming INVITE's
input characteristics.
 [2] Alt Route Consider Inputs = If the call cannot be
routed to the main route (Route Row), the call is routed
to this alternative route only if the incoming INVITE
matches this routing rule's input characteristics.
Notes:
 For IP-to-IP alternative routing, configure SBC
alternative routing reasons upon receipt of 4xx, 5xx, and
6xx SIP responses (using the ini file table parameter
SBCAlternativeRoutingReasons).
 The alternative routing entry ([1] or [2]) must be defined
in the next consecutive table entry index to the Route
Row entry (i.e., directly below it). For example, if Index 4
is configured as a Route Row, Index 5 must be
configured as the alternative route.
 Multiple alternative route entries can be configured (e.g.,
Index 1 is the main route - Route Row - and indices 2
through 4 are configured as alternative routes).
 Alternative routing applies to INVITE and other dialog
initiating SIP messages (except REGISTER messages).
 If no response, ICMP, or 408 SIP response is received,
the device attempts to use the alternative route even if
no entries are configured in the ‘SBC Alternative Routing
Reasons’ table.
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