ETSI PRI 13-19
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
Additionally, if enhanced overflow is disabled, network-based DTO is
invoked when the following occurs:
• A call receives a release message from an ETSI PRI interface with a
cause of BUSY or GNCT.
• DTO is allowed for that call (through the NCS action code and trunk
group option DTO enabled); then network DTO is invoked with the
intent to access another route.
A TRKGRP parameter is used to enable/disable network-based DTO on
ETSI PRI trunks. When network DTO is invoked, an overflow treatment
request is sent to the DAP. The DAP provides the overflow response with
new route information.
The following NCS network DTO overflow action codes are supported:
• 2—7-digit termination with overflow
• 11—10-digit termination with overflow
• 51—flexible termination with overflow
Enhanced overflow
Enhanced overflow is supported for terminating ETSI PRI interfaces if the
ENHANCED_OVERFLOW office parameter is set to “Y” at the originating
DMS-250 switch.
Enhanced overflow is invoked when the following occurs:
• A call cannot terminate due to an all trunks busy condition or the trunk
receives a release message from an ETSI PRI with a non-normal release
cause or no answer timer.
• Direct termination overflow is allowed for that call (through the NCS
action code); then enhanced overflow is invoked.
The following NCS overflow action codes are supported:
• 2—7-digit termination with overflow
• 11—10-digit termination with overflow
• 12—DDD routing with overflow
• 13—international with overflow
• 51—flexible termination with overflow
• 53—outbound VNET with overflow
Enhanced overflow is also supported for Remote Access and Suppcode
collections on ETSI PRI trunks. Two existing Application Data Field (ADF)
parameters, NO ANSWER TIMER and NCS INFORMATION, are used. If
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