CHAPTER25 Routing
Mediant 1000 Gateway & E-SBC | User's Manual
● 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.
● For mapping SIP-to-Q.931 and Q.931-to-SIP release causes, see Configuring
Release Cause Mapping.
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:
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).
b. Click New; the following dialog box appears:
c. Configure a Q.931 release cause code for alternative routing according to the parameters
described in the table below.
d. Click Apply.
Table 25-9: Reasons for IP-to-Tel Alternative Routing Table Parameter Descriptions
Parameter Description
'Index'
[AltRouteCauseIP2Tel_
Index]
Defines an index number for the new table row.
Note: Each row must be configured with a unique index.
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