Overflow Call Control; Direct Termination Overflow; Enhanced Overflow - Nortel DMS-250 Reference Manual

Overflow call control

Two types of overflow call control are available with the DMS-250 switch:

Direct termination overflow

Direct termination overflow is the control by the terminating switch of
overflow processing and intiation of overflow transaction.

Enhanced overflow

Enhanced overflow has the following capability:
— If the number of digits datafilled in the SUPPCODE field of table
MLTATTR is less than the number datafilled in the ACCTLEN field
in table AUTHCODM, or less than specified by the NCS response
message, then PDIL treatment is initiated. Only the number of digits
datafilled in the SUPPCODE field of table MLTATTR is recorded in
the billing record.
— When supplementary/account code processing is required (either
in-switch or out-of-switch) and no digits are datafilled in the
SUPPCODE field of table MLTATTR, PDIL treatment is initiated.
— When supplementary/account code processing is required (either
in-switch or out-of-switch) and the LTCOPT field in table LTCALLS
does not contain the MLTIDX option with a value greater than zero,
PDIL treatment is initiated.
— If the ACCTLEN field in table AUTHCODM is equal to one
(indicating in-switch account code collection of one digit, per current
functionality), the call is blocked with PDIL treatment and a
TRK255 log containing the text VPNAUTH_ON_NONVPN_CALL
is generated.
— If the number of digits datafilled in the SUPPCODE field of table
MLTATTR is less than the number of digits datafilled in the
ACCTLEN field in table AUTHCODM, or less than the number of
digits specified by the supplementary code response message
received from the NCS, then PDIL treatment is initiated.
FNAL treatment is initiated and the call is dropped if the ACCTLEN file
in table AUTHCODM is greater than zero (indicating in-switch account
code collection) and NCS returns a message indicating out-of-switch
supplementary code collection is required.
direct termination overflow
enhanced overflow
consolidates control of the overflow process at the originating switch
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
Feature interaction 7-41