Translation Example - Nortel DMS-250 Reference Manual

CALLATTR and verified. For more information, refer to Chapter 7,
"Feature interaction."
Supplementary or account code
If the incoming message needs supplementary code (or suppcode) collection
or account code collection, the call is not blocked. The suppcode/account
code is retrieved from table MLTATTR. (The index to this table is obtained
from table LTCALLS.) For more information, refer to Chapter 7, "Feature
interaction."
Call translation
Before the DMS-250 switch can route a call, the switch must perform
translation. Translation occurs when the DMS-250 switch access the
information in a message signal and processes the information according to
datafill tables.
To begin translation, the DMS-250 switch accesses the SETUP message.
This message is composed primarily of information elements. Each
information element provides a part of the setup data. The switch checks the
called party number and the call type in the SETUP message (or the
numbering plan indicator if no call type is available) to determine how to
translate the call.
Translation analyzes the information collected by using the trunk group
tables. Information in the trunk group tables indexes one of the translation
tables. Each translation table in turn indexes another until the call is fully
translated and can be routed.

Translation example

Figure 5-3 highlights some of the main information the DMS-250 switch
uses to translate and route a call. Values that map into another table are
circled.
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
Call control procedures 5-5