User's Manual 500 Document #: LTRT-27045
Mediant 1000B Gateway & E-SBC
b. Click New; the following dialog box appears:
Figure 23-13: Reasons for IP-to-Tel Alternative Routing Table - Add Dialog Box
c. Configure a Q.931 release cause code for alternative routing according to the
parameters described in the table below.
d. Click Apply.
Table 23-9: 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.
Release Cause
rel-cause
[AltRouteCauseIP2Tel_ReleaseCause]
Defines a Q.931 release code that if received, the device
attempts to route the call to an alternative destination (if
configured).
23.5.2 Alternative Routing to an IP Destination upon a Busy Trunk
The Forward on Busy Trunk Destination table lets you configure alternative routing rules for
forwarding (i.e., call redirection) IP-to-Tel calls to an alternative IP destination using SIP
3xx responses. The alternative routing is triggered upon the following:
Digital interfaces: Trunk Group has no free channels (i.e., “busy”).
Analog interfaces: Unavailable FXS / FXO Trunk Group. This feature can be used, for
example, to forward the call to another FXS / FXO device.
This feature is configured per Trunk Group. The alternative destination can be defined as a
host name or as a SIP Request-URI user name and host part (i.e., user@host). For
example, the below configuration forwards IP-to-Tel calls to destination user “112” at host
IP address 10.13.4.12, port 5060, using transport protocol TCP, if Trunk Group ID 2 is
unavailable:
ForwardOnBusyTrunkDest 1 = 2, 112@10.13.4.12:5060;transport=tcp;
When configured with user@host, the original destination number is replaced by the user
part.
The device forwards calls using this table only if no alternative IP-to-Tel routing rule has
been configured in the IP-to-Tel Routing table or alternative routing fails and the following
reason(s) in the SIP Diversion header of 3xx messages exists:
Digital interfaces: “out-of-service” - all trunks are unavailable/disconnected
"unavailable":
• Digital interfaces: All trunks are busy or unavailable
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