Nortel DMS-250 - Enhanced Cause and Treatment Handling

Call control procedures 5-31
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
Enhanced cause and treatment handling
This feature allows the datafill of mapping treatments-to-causes,
causes-to-treatments, or causes-to-causes.
Enhanced cause and treatment handling includes the following features:
• an expanded table TMTMAP
— used to map treatments to cause values or another treatment
— utilized when a treatment is set in-switch and the originating trunk
type is either ISUP or PRI
— contains the same fields as the standard TMTMAP table; CAUSE
and PROTOCOL are the only two fields that differ from the standard
TMTMAP version
• table CSEMAP that replaces table CAUSEMAP
— maps an incoming cause value to a treatment or another cause value
— is utilized when a non-normal call clearing message is received on
terminating ISUP or PRI trunks
— parameters can be datafilled
— contains the following fields: PROTOCOL, CAUSEREC,
CODESTD, ROUTEADV, TMTPROC, CSE2SND, CSTD2SND,
TMT, and LOG
• expanding table TRKGRP with the addition of parameter STDIDX
(Protocol Standard Index)
— STDIDX contains the following choices: Q764, TR394, TR444,
A607, Q931, BUSY, ALL, NOPROP, PROT1, and PROT2.
— The information in this parameter, coupled with the information
datafilled in either table CSEMAP or table TMTMAP, determines
whether to apply an in-band treatment or send a call clearing
message with cause to the originating switch.
• expanded originating trunk group parameters for ISDN PRI, reseller
IMT, RLT IMT, MWC ISUP IMT, and ISUP FGD
The expanded PROTOCOL field contains the following choices: Q764,
TR394, TR444, A607, Q931, BUSY, ALL, PROT1, and PROT2.
Datafill
A “Y” in the CSE_TRMT_ENHANCEMENTS parameter selects the
Enhanced cause and treatment handling feature.