AudioCodes Mediant 2000 User Manual page 357

SIP User's Manual
Parameter
Web: Reasons for Alternative IP-to-Tel Routing Table
EMS: Alt Route Cause IP to Tel
[AltRouteCauseIP2Tel]
Version 5.8
Notes:

This parameter can include up to 5 indices.

The reasons for alternative routing for Tel-to-IP calls only
apply when a Proxy is not used.

When there is no response to an INVITE message (after
INVITE retransmissions), the device issues an internal 408
'No Response' implicit release reason.

The device sends the call to an alternative IP route only
after the call has failed and the device has subsequently
attempted twice to establish the call unsuccessfully.

For an explanation on using ini file table parameters, refer
to ''Format of ini File Table Parameters''
This ini file table parameter configures call failure reason
values received from the PSTN side (in Q.931 presentation). If
a call is released as a result of one of these reasons, the
device attempts to locate an alternative Trunk Group for the
call in the 'IP to Trunk Group Routing' table.
The format of this parameter is as follows:
[AltRouteCauseIP2Tel]
FORMAT AltRouteCauseIP2Tel_
AltRouteCauseIP2Tel_ReleaseCause
[\AltRouteCauseIP2Tel]
For example:
AltRouteCauseIP2Tel 0 = 3
AltRouteCauseIP2Tel 1 = 1
AltRouteCauseIP2Tel 2 = 17 (Busy Here)
Notes:

This parameter can include up to 5 indices.

If the device fails to establish a call to the PSTN because it
has no available channels in a specific Trunk Group (e.g.,
all the channels are occupied, or the spans are
disconnected or out-of-sync), it uses the Internal Release
Cause '3' (No Route to Destination). This cause can be
used in the AltRouteCauseIP2Tel table to define routing to
an alternative trunk group.

This table can be used for example, in scenarios when the
destination is busy and the release reason #17 is issued, or
for other call releases that issue the default release reason
(#3).

For an explanation on using ini file table parameters, refer
to ''Format of ini File Table Parameters''
357
6. Configuration Parameters Reference
Description
on page
Index =
;
(No Route to Destination)
(Unallocated Number)
on page
199 .
199 .
October 2009