SIP User's Manual 176 Document #: LTRT-12804
Mediant 800 MSBG
3.3.2.11.3.5 Configuring Call Forward upon Busy Trunk
The 'Forward on Busy Trunk Destination' page allows you to configure forwarding of IP-to-
Tel calls (call redirection) to a different (alternative) IP destination, using SIP 3xx
responses, upon the following scenarios:
For digital interfaces: If a Trunk Group has no free channels (i.e., “busy” Trunk Group).
For analog interfaces: if an unavailable FXS/FXO Hunt Group exists. This feature can
be used, for example, to forward the call to another FXS/FXO device.
This alternative destination is configured per Hunt Group.
The alternative destination can be defined as a host name (IP address with optional port
and transport type), 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 or alternative routing fails, and one of the following reasons (included in
the SIP Diversion header of 3xx messages) exists:
For digital interfaces: “out-of-service” - all trunks are unavailable/disconnected
"unavailable":
• For digital interfaces: All trunks are busy or unavailable
• For analog interfaces: All FXS/FXO lines pertaining to a Hunt Group are busy or
unavailable
Note: You can also configure the Forward on Busy Trunk Destination table using
the ini file parameter table ForwardOnBusyTrunkDest.
¾ To configure the Forward on Busy Trunk Destination rules:
1. Open the 'Forward on Busy Trunk Destination' page (Configuration tab > VoIP menu
> GW and IP to IP submenu > Routing submenu > Forward on Busy Trunk).
Figure 3-87: Forward on Busy Trunk Destination Page
The figure above displays a configuration that forwards IP-to-Tel calls destined for
Hunt Group ID 1 to destination IP address 10.13.5.67 if the conditions mentioned
earlier exist.
2. Configure the table as required, and then click the Submit button to save your
changes.
3. To save the changes so they are available after a power fail, see ''Saving
Configuration'' on page 336.
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