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5-22 Call control procedures
The OTG, OSID, and DNIS values are taken from the ISUP IAM message
that comes from the originating switch. The Generic Digits parameter and
Generic Address information element allow the EVS switch to deliver digits
to the end user.
Reseller switch setup and release
A normal call setup and release using a reseller switch is shown in Figure
5-13. Supplement code (suppcode) collection requires the local formulation
of an Address Completed Message (ACM) to cut through the voice path for
DTMF digit collection by a universal tone receiver. The later ACM received
from the far-end switch is then halted.
Suppcode collection
The suppcode is collected only if the following conditions exist:
297-2521-106 Standard 23.01 March 2001
The tuple set for the (IMT) trunk in table TRKGRP has field ISUPIDX
set to MWC2RSLR.
The field ACCTLEN (account code length) in table TRKGRP is set
within the range of 1–7 for non-VNET calls, or within the range of 1–11
for VNET calls.
The interexchange switch sent back a locally formed ACM.
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