Version 7.2 499 Mediant 1000B Gateway & E-SBC
User's Manual 23. Routing
The default release code is Cause Code No. 3 (No Route to Destination). You can change
the default code as follows:
 To change the default Q.931 release code:
1. Open the Gateway Advanced Settings page (Setup menu > Signaling & Media tab >
Gateway folder > Gateway Advanced Settings).
2. In the 'Default Release Cause' field, enter the release cause code:
Figure 23-11: Configuring Default Q.931 Release Cause Code
3. Click Apply.
Note:
• If a Trunk is disconnected or not synchronized, the device issues itself the internal
Cause Code No. 27. This cause code is mapped (by default) to SIP 502.
• The default release cause is described in the Q.931 notation and translated to
corresponding SIP 40x or 50x values (e.g., Cause Code No. 3 to SIP 404, and
Cause Code No. 34 to SIP 503).
• For analog interfaces: For information on mapping PSTN release causes to SIP
responses, see PSTN Release Cause to SIP Response Mapping on page 528.
• For mapping SIP-to-Q.931 and Q.931-to-SIP release causes, see Configuring
Release Cause Mapping on page 521.
The following procedure describes how to configure alternative routing reasons for IP-to-
Tel calls through the Web interface. You can also configure it through ini file
(AltRouteCauseIP2Tel) or CLI (configure voip > gateway routing alt-route-cause-ip2tel).
 To configure alternative Trunk Group routing based on Q.931 cause codes:
1. Open the Proxy & Registration page (Setup menu > Signaling & Media tab > SIP
Definitions folder > Proxy & Registration).
2. From the 'Redundant Routing Mode' drop-down list, select Routing Table so that the
device uses the IP-to-Tel Routing table for alternative routing:
Figure 23-12: Enabling Alternative Routing based on SIP Responses
3. Open the IP-to-Tel Routing table, and then configure alternative routing rules with the
same call matching characteristics as the "main" routing rule, but with different Trunk
Group destinations.
4. Configure Q.931 cause codes that invoke alternative IP-to-Tel routing:
a. Open the Reasons for IP-to-Tel Alternative Routing table (Setup menu >
Signaling & Media tab > Gateway folder > Routing > Alternative Routing
Reasons > Reasons for IP > Tel).
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