ETSI PRI 13-11
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
•
CGNDELV = Secondary CHGDELV = Primary
NOATONSC = Yes CGNPISCR = Yes
If CHG is available, CHg is delivered as CGN with PI of “Allowed” and
SI of “Network Provided”. Otherwise, if CGN is available, CGN is
delivered based on the NOA/TON field and the PI field of the CGN
parameter. The NOA/TON is checked first. If NOA/TON is
“Subscriber”, PI is not screened and CGN is not delivered. PI is
screened for any other value of NOA/TON. If PI is “Restricted”, the
CGN is not delivered. CGN is delivered for any other value of PI.
ANSI PRI
The process to determine the CGN delivery for ANSI PRI terminations is
discussed below. The CPIALLOW field in table CALLATTR must be
datafilled as “Y”.
Delivery of the CGN Information Element (IE) for ANSI PRI terminations
is based on fields CGNDELV, CHGDELV, CGNPISCR, and CHGPOSCR in
table CPIATTR and is described below:
• CGNDELV = Always CHGDELV = Never
CGNPISCR = N
If CGN is available, the CGN is delivered.
• CGNDELV = Primary CHGDELV = Secondary
CGNPISCR = No
If CGN is available, the CGN is delivered. Otherwise if CHG is
available, CHG is delivered as CGN with PI set to “Allowed” and SI set
to “Network Provided”.
• CGNDELV = Secondary CHGDELV = Primary
CGNPISCR = No CHGPISCR = No
If CHG is available, the CHG is delivered as CGN with PI set to
“Allowed” and SI set to “Network” Provided”. If CHG is not available
and CGN is available, CGN is delivered.
• CGNDELV = Secondary CHGDELV = Primary
NOATONSC = No CGNPISCR = Yes
If CHG is available, the availability of CGN is determined. If CGN is
not available, CHG is delivered as CGN with PI set to “Allowed” and SI
set to “Nework Provided”. If CGN is available, the PI of the CGN
parameter is screened. If PI is “Restricted”, CGN is not delivered. For
any other value of PI, CHG is delivered as CGN with PI set “Allowed”
and SI set to “Network Provided”. If CHG is not available and CGN is
available, CGN is delivered.
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