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

User's Manual
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 table (Configuration tab >
VoIP menu > Gateway > Routing > Alternative Routing Reasons > Reasons
for IP-to-Tel).
b. Click Add; the following dialog box appears:
Figure 24-8: Reasons for IP-to-Tel Alternative Routing Table - Add Row Dialog Box
c. Configure a Q.931 release cause code for alternative routing according to the
parameters described in the table below.
d. Click Add.
Table 24-9: Reasons for IP-to-Tel Alternative Routing Table Parameter Descriptions
Parameter
Index
[AltRouteCauseIP2Tel_Index]
Release Cause
rel-cause
[AltRouteCauseIP2Tel_ReleaseCause]

24.7.2 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.
The device forwards calls using this table only if no alternative IP-to-Tel routing rule has
been configured in the Inbound IP Routing table or alternative routing fails and the
following reason(s) in the SIP Diversion header of 3xx messages exists:
Version 7.0
Defines an index number for the new table row.
Note: Each row must be configured with a unique index.
Defines a Q.931 release code that if received, the device
attempts to route the call to an alternative destination (if
configured).
521
Description
Mediant 800B Gateway and E- SBC
24. Routing