Version 7.2 669 Mediant 1000B Gateway & E-SBC
User's Manual 33. Routing SBC
Note:
• If the device receives a SIP 408 response, an ICMP message, or no response,
alternative routing is still performed even if the code is not configured in the
Alternative Routing Reasons table.
• SIP requests belonging to an SRD or IP Group that have reached the call limit
(maximum concurrent calls and/or call rate) as configured in the Call Admission
table are sent to an alternative route if configured in the IP-to-IP Routing table for
the SRD or IP Group. If no alternative routing rule is located, the device
automatically rejects the SIP request with a SIP 480 (Temporarily Unavailable)
response.
The following procedure describes how to configure the Alternative Routing Reasons table
through the Web interface. You can also configure it through ini file
(SBCAlternativeRoutingReasons) or CLI (configure voip > sbc routing sbc-alt-routing-
reasons).
 To configure SIP reason codes for alternative IP routing:
1. Open the Alternative Routing Reasons table (Setup menu > Signaling & Media tab >
SBC folder > Routing > Alternative Reasons).
2. Click New; the following dialog box appears:
Figure 33-7: Alternative Routing Reasons Table - Dialog Box
3. Configure a SIP response code for alternative routing according to the parameters
described in the table below.
4. Click Apply.
Table 33-4: Alternative Routing Reasons Table Parameter Descriptions
Parameter Description
Index
[SBCAlternativeRoutingReason
s_Index]
Defines an index number for the new table row.
Note: Each row must be configured with a unique index.
Release Cause
rel-cause
[SBCAlternativeRoutingReason
s_ReleaseCause]
Defines a SIP response code for triggering the device's alternative
routing mechanism.
[4] 4xx; [5] 5xx; [6] 6xx; [400] Bad Request; [402] 402 Payment
Required; [403] Forbidden; [404] Not Found; [405] Method Not
Allowed; [406] Not Acceptable; [408] Request Timeout (Default);
[409] Conflict; [410] Gone; [413] Request Too Large; [414] Request
URI Too Long; [415] Unsupported Media; [420] Bad Extension;
[421] Extension Required; [423] Session Interval Too Small; [480]
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