Alternative Routing To An Ip Destination Upon A Busy Trunk - AudioCodes Mediant 800B User Manual


To configure alternative Trunk Group routing based on Q.931 cause codes:
1. In the Proxy & Registration page, set the 'Redundant Routing Mode' parameter to
Routing Table so that the device uses the Inbound IP Routing table for alternative
routing.
2. In the Inbound IP Routing table, configure alternative routing rules with the same call
matching characteristics, but with different Trunk Group destinations.
3. Configure Q.931 cause codes that invoke alternative IP-to-Tel routing:
a. Open the Reasons for IP-to-Tel Alternative Routing page (Configuration tab >
VoIP menu > GW and IP to IP > Routing > Alternative Routing Reasons >
Reasons for IP-to-Tel).
b. Click Add; the following dialog box appears:
Figure 24-7: IP to Tel Reasons - Reasons for Alternative Routing Page
c. Configure a Q.931 release cause code for alternative routing according to the
parameters described in the table below.
d. Click Submit, and then save ("burn") your settings to flash memory.
Table 24-7: Reasons for IP-to-Tel Alternative Routing Table Parameter Descriptions
Parameter
Index
[AltRouteCauseIP2Tel_Index]
Release Cause
CLI: rel-cause
[AltRouteCauseIP2Tel_ReleaseCause]

24.6.2 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. These rules are used upon the following:

For digital interfaces: Trunk Group has no free channels (i.e., "busy").

For 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.
User's Manual
Description
Defines an index number for the new table record.
Defines a Q.931 release code that if received, the device
attempts to route the call to an alternative destination (if
configured).
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Mediant 800B Gateway and E-SBC
Document #: LTRT-10620