Nortel DMS-250 - Page 258

13-16 ETSI PRI
297-2521-106 Standard 23.01 March 2001
Shared VNET access
Shared VNET processing occurs when one of the following conditions are
met:
• The ANISCRN field in table RTGATTR is set to “Y,” the VNETCUST
field in table RTGRATTR is set to “NIL,” and the VNET CUST field in
table ANISCRN is set to “Y.”
• The optional field ANISCRN is turned on in table TRKGRP and the
VNETCUST field in table ANISCRN is set to “Y.”
Dedicated VNET access
NCS/DAP message processing access is controlled by the PRIVDIAL field
in table CALLATTR. If this field is not set to “NCS,” no NCS message
processing takes place; in-switch routing is invoked instead. The DMS-250
switch supports a VNET address digit length of 1–15 digits (excluding the
prefix). The VLPD/FlexDTC is used as a basis for this logic.
If the address digits received in the called party number are not datafilled in
the pretranslator, the type of number indicator set in the setup message
determines the processing. These types of number indicators and their
processing are listed as follows:
• subscriber number—Call is processed in the same manner as when an
address is datafilled with an ONNET pretranslation selector.
• national number—Call is processed in the same manner as when an
address is datafilled with an OFFNET pretranslation selector.
• international number—Call is processed in the same manner as when an
address is datafilled with an IP pretranslation selector.
Post-NCS/DAP processing
The DAP can return one of the following responses:
• ROUTING RESPONSE—sent by the NCS to the originating switch to
indicate successful translation of the VNET call. The information
returned is used to route the call to the correct DMS-250 switch and
trunk.
• FAILURE RESPONSE—sent by the NCS to the originating or
termination switch to indicate there was some kind of translation failure.
The action code specifies the type of failure.
• SUPP-CODE DIGITS COLLECTION RESPONSE—sent by the NCS to
the originating switch to indicate suppcode is to be collected for this call.
• OVERFLOW RESPONSE—sent by the NCS to the terminating switch
to indicate a successful translation of the VNET overflow request. The
information returned is used to route the call to the correct DMS-250
switch and trunk.