AudioCodes Mediant 3000 User Manual page 448

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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).
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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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Least cost routing (LCR): If the LCR feature is enabled, the device searches the
routing table for matching routing rules and then selects the one with the lowest call
cost. The call cost of the routing rule is done by assigning it a Cost Group. For
configuring Cost Groups, see 'Least Cost Routing' on page 215. If two routing rules
have identical costs, then the rule appearing higher up in the table (i.e., first-matched
rule) is used. If a selected route is unavailable, the device uses the next least-cost
routing rule. However, even if a matched rule is not assigned a Cost Group, the device
can select it as the preferred route over other matched routing rules with Cost Groups,
according to the settings of the LCR parameter, LCRDefaultCost (see 'Enabling LCR
and Configuring Default LCR' on page 217).
Note:
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To configure SBC IP-to-IP routing rules:
1. Open the IP-to-IP Routing Table page (Configuration tab > VoIP menu > SBC
submenu > Routing SBC submenu > IP to IP Routing Table).
User's Manual
SIP response code (i.e., 4xx, 5xx, and 6xx SIP responses) configured in the
SBC Alternative Routing Reasons table (see 'Configuring Alternative Routing
Reasons' on page 453).
SIP 408 Timeout or no response (after timeout).
The IP-to-IP Routing table can also be configured using the table ini file
parameter, IP2IPRouting (see 'SBC Parameters' on page 835).
448
Mediant 3000
Document #: LTRT-89729