Standard Cause And Treatment Handling - Nortel DMS-250 Reference Manual

5-30 Call control procedures
Treatment routing
The DMS-250 switch can specify that treated calls be routed to tone,
announcement, or an outgoing route using a TREAT subtable from table
TMTCNTL. Because individual treatment subtables may not necessarily list
all possible treatment codes, the switch may have to access several treatment
control subtables until it encounters the treatment code result prescribed by
the operating telephone company.
The order of precedence for determining the result of the treatment code is
as follows.
1 The switch looks for the treatment code in the subtable at a position
2 If treatment code is not found as described in 1, the switch looks for the
3 If treatment code is not found as described in 1 or 2, the switch looks for
No matter what table the treatment is in, the routing result of the treatment
table (the specification of the tone, announcement, or office route) is ignored
for originating PRI trunks. Instead, all treatments incurred on originating
PRI trunks result in a DISC or REL message with a cause value obtained
through treatment-to-cause mapping.
Alternate treatments
The DMS-250 switch can also specify that all calls routed to treatment from
a PRI route according to the information datafilled in the ALTERNATE
subtable of TMTCNTL. This takes the place of the reference to the PRA250
subtable and precludes the possibility of referencing both subtables. Use of
alternate treatments is specified using the ALTERNATE parameter in the
trunk group table for the incoming PRI trunk group.
The DMS-250 switch, through table OFCOPT, offers two options for cause
and treatment handling: standard or enhanced.

Standard cause and treatment handling

This mapping is fixed (hard-coded) and cannot be changed.
Datafill
Datafilling the mapping of causes to treatments (or another cause) is not
available if "N" is entered in the CSE_TRMT_ENHANCEMENTS
parameter of table OFCOPT.
297-2521-106 Standard 23.01 March 2001
relevant to the originator of the call (for example, position PRA250 for
calls originated by a PRI).
treatment code in the subtable at position PRA250.
treatment code RODR in subtable at position OFFTREAT.