Changing a Blocked OPC Screen
This procedure is used to change the attributes of a
blocked originating point code (OPC) screen in the database using the
chg-scr-blkopc
command. The parameters
used by the
chg-scr-blkopc
command are shown in
the
Gateway Screening Attributes
section. The general rules that apply to configuring gateway screening entities
are shown in the
Gateway Screening Configuration
section.
The example in this procedure is used to change the
point code 002-002-002 for the blocked OPC screen
gws7
to 230-230-230.
Note:
If you using multiple-part ITU national point codes with gateway screening, 14-Bit ITU National Point Code Formats section.If the current
ni
,
nc
, and
ncm
are equal to the character
“
c
”
, only the next
screening function identifier and next screening reference can be changed. The
next screening function identifier cannot be equal to
fail
. If the next screening function
identifier is not equal to
stop
, the next screening reference
must be specified. Otherwise, only the point code can be changed.
The blocked OPC screen can reference one of the following screens.
- Allowed SIO
- Allowed DPC
- Blocked DPC
- Allowed CGPA
Verifying the Gateway Screening Configuration
Enter the following commands to verify that these screens are in the database.
rtrv-scr-sio:all=yes
rtrv-scr-dpc:all=yes
rtrv-scr-blkdpc:all=yes
rtrv-scr-cgpa:all=yes
Gateway Screening Configuration Procedures
If the desired screen is not in the database, perform one of these procedures to add the desired screen to the database.
- Adding an Allowed SIO Screen
- Adding an Allowed DPC Screen
- Adding a Blocked DPC Screen
- Adding an Allowed Calling Party Address Screen
- Changing an Allowed SIO Screen
- Changing an Allowed DPC Screen
- Changing a Blocked DPC Screen
- Changing an Allowed Calling Party Address Screen
For the first entry for a specific screening reference,
the value for the point code must be
c
, and the NSFI must be either
stop
,
sio
,
dpc
,
blkdpc
, or
cgpa
. If the NSFI is
stop
, the screening of the message
will stop at the specified blocked OPC screen. If the NSFI is either
sio
,
dpc
,
blkdpc
, or
cgpa
, then any message containing a
point code that is not listed in the blocked OPC screen with a NSFI equal to
fail
, will continue to be screened
with either the allowed SIO, allowed DPC, blocked DPC, or the allowed CGPA
screen.
All subsequent entries for that screening reference must
contain a numeric point code value, the NSFI must be equal to
fail,
and the
nsr
parameter cannot be specified. Any
message that contains an OPC in the blocked OPC screen with the NSFI equal to
fail
will be rejected from the network
and the screening process is stopped.
The
pcst
or
npcst
parameters, specifying whether
or not the ITU-I or 14-bit ITU-N point code is a spare point code, cannot be
used with the
zone=c
or
npc=c
parameters.
Specifying a Range of Values
A range of values can be specified for the point code
parameters
ni
,
nc
, or
ncm
.
If a range of values is specified for any of these parameters, and the value of the other parameters match existing values for the screening reference name, the range of values for the point code parameter cannot include any values for that parameter that are currently provisioned for the screening reference name.
For example, screening reference name
scr1
contains these entries:
SR NI NC NCM NSFI NSR/ACT
SCR1 240 001 010 FAIL ------
SCR1 241 010 020 FAIL ------
Another entry for screening reference
scr1
with the
ni
value of 240 and the
nc
value of 001 cannot be specified if
the range of values for the
ncm
parameter includes the value 010.
The ANSI point code parameter values can be specified as
a single value, a range of values, or with an asterisk (*). The asterisk
specifies all possible values for the
ni
,
nc
, and
ncm
parameters.
Table 11-5
shows the valid combinations of these parameter values.
Table 11-5 Valid Value Combinations for ANSI Point Code Parameters
NI | NC | NCM |
---|---|---|
Single Value | Single Value | Single Value |
Single Value | Single Value | Range of Values |
Single Value | Single Value | Asterisk |
Single Value | Range of Values | Asterisk |
Single Value | Asterisk | Asterisk |
Range of Values | Asterisk | Asterisk |
Asterisk | Asterisk | Asterisk |
A range of values can also be specified for an ITU-I or 24-bit ITU-N point code parameter using a combination of asterisks (*) and single values for the point code parameters. Table 11-6 shows the valid combinations of the ITU-I parameter values. Table 11-7 shows the valid combinations of the 24-bit ITU-N parameter values.
Table 11-6 Valid Value Combinations for ITU-I Point Code Parameters
ZONE | AREA | ID |
---|---|---|
Single Value | Single Value | Single Value |
Single Value | Single Value | Asterisk |
Single Value | Asterisk | Asterisk |
Asterisk | Asterisk | Asterisk |
Table 11-7 Valid Value Combinations for 24-Bit ITU-N Point Code Parameters
MSA | SSA | SP |
---|---|---|
Single Value | Single Value | Single Value |
Single Value | Single Value | Asterisk |
Single Value | Asterisk | Asterisk |
Asterisk | Asterisk | Asterisk |
Figure 11-11 Change a Blocked OPC Screen - Sheet 1 of 5
Figure 11-12 Change a Blocked OPC Screen - Sheet 2 of 5
Figure 11-13 Change a Blocked OPC Screen - Sheet 3 of 5
Figure 11-14 Change a Blocked OPC Screen - Sheet 4 of 5
Figure 11-15 Change a Blocked OPC Screen - Sheet 5 of 5