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Figure 7-4
IEC translation and routing compared to route reference routing
Origination
AUTHCODE
validation
ISA
RTEREF
routing
Route
selection
Termination
Route reference routing
RTEREF allows calls to be terminated immediately after authcode
screening, without any form of digit interpretation or translations. This
routing method provides a substantial decrease in call completion time. Use
of the RTEREF parameter essentially provides a "virtual nailed-up"
connection between the originator and the terminator. In essence, the
originator has a dedicated connection directly to the terminator. ISA
RTEREF routing allows calls to be terminated immediately after
AUTHCODE validation without the need for any form of digit interpretation
or translations.
The parameters required to invoke ISA RTEREF routing are in table
LTCALLS. Table LTCALLS contains the data for all call types on a PRI
interface. Each LTID/call type combination may have unique parameters
associated with it, providing for a multiple of unique ISA RTEREF
combinations. The LTCALLS fields required to invoke ISA RTEREF
routing are listed in Table 7-3.
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
Feature interaction 7-9
XLAIEC translation
and routing
Digit
interpretation
Translation
Screening
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