Configuring Sip Response Codes For Alternative Routing Reasons - AudioCodes Mediant 1000B User Manual

Parameter
Group Policy
CLI: group-policy
[IP2IPRouting_GroupPolicy]
Cost Group
[IP2IPRouting_CostGroup]
CLI: cost-group
29.5.4 Configuring SIP Response Codes for Alternative Routing
Reasons
The SBC Alternative Routing Reasons table lets you configure up to 20 SIP response
codes for call release (termination) reasons. If a call (outgoing SIP dialog-initiating
methods, e.g., INVITE, OPTIONS, and SUBSCRIBE messages) is released as a result of a
configured SIP code (provided in SIP 4xx, 5xx, and 6xx), the device attempts to locate an
alternative route for the call in the IP-to-IP Routing table. Alternative routing rules are
configured with the 'Alternative Route Options' parameter set to Alt Route Ignore Inputs
or Alt Route Consider Inputs (see ''Configuring SBC IP-to-IP Routing Rules'' on page
530).
Typically, the device performs alternative routing when there is no response at all to an
INVITE message. This is done after a user-defined number of INVITE re-transmissions,
configured by the SIPMaxRtx parameter. In such a scenario, the device issues itself the
SIP response code 408 (Request Timeout). Alternative routing is only done if you have
configured this response code in the SBC Alternative Routing Reasons table.
User's Manual
Notes:

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.

The Forking Group members must be configured in a
table row that is immediately below the main Forking
routing rule, or below an alternative routing rule for the
main rule, if configured.

For IP-to-IP alternative routing, configure alternative
routing reasons upon receipt of 4xx, 5xx, and 6xx SIP
responses (see Configuring SIP Response Codes for
Alternative Routing Reasons on page 538). However, if
no response, ICMP, or a SIP 408 response is received,
the device attempts to use the alternative route even if no
entries are configured in the 'SBC Alternative Routing
Reasons' table.

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).
Defines whether the routing rule includes call forking.

[0] None (default) = Call uses only this route (even if
Forking Group members are configured in the rows below
it).

[1] Forking = Call uses this route and the routes of
Forking Group members, if configured (in the rows below
it).
Assigns a Cost Group to the routing rule for determining the
cost of the call. To configure Cost Groups, see ''Configuring
Cost Groups'' on page 230.
By default, no Cost Group is defined.
538
Mediant 1000B Gateway & SBC
Description
Document #: LTRT-27034