Removing an Allowed ISUP Message Type Screen

This procedure is used to remove an allowed ISUP message type (ISUP) screen from the database using the dlt-scr-isup command. The parameters used by the dlt-scr-isup 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.

Since both ISUP and TUP messages are screened by the allowed ISUP message type screen, the dlt-scr-isup command contains a parameter for the ISUP message type (isupmt) and a parameter for the TUP message type (tupmt). Only one of these parameters can be specified for the allowed ISUP screen being removed from the database.

The example in this procedure removes the allowed ISUP screen isp2 from the database.

The allowed ISUP screen can be referenced by one of the following screens.

Allowed SIO
Allowed DPC
Blocked DPC

Verifying the Gateway Screening Configuration

Enter the following commands to verify that none of these screens reference the allowed ISUP screen being removed from the database.

rtrv-scr-sio:nsfi=isup
rtrv-scr-dpc:nsfi=isup
rtrv-scr-blkdpc:nsfi=isup

Gateway Screening Configuration Procedures

To change the NSFI of any of these screens, perform to one of these procedures.

Display the allowed ISUP screens in the database using the rtrv-scr-isup command.
The following is an example of the possible output.
```
rlghncxa03w 06-10-25 15:25:30 GMT EAGLE5 36.0.0
SCREEN = ALLOWED ISUP
SR    REF  RULES
IEC   YES     2
ISP1  YES     1
ISP2  YES     2
TUP1  YES     1
WRD2  YES     1
WRD4  YES     1
```
From the rtrv-scr-isup output, display the allowed ISUP screen you wish to remove using the rtrv-scr-isup command with the screening reference name. For this example, enter this command.

rtrv-scr-isup:sr=isp2

The following is an example of the possible output.
```
rlghncxa03w 06-10-25 15:30:30 GMT  EAGLE5 36.0.0
SCREEN = ALLOWED ISUP
SR   ISUPMT/   NSFI    NSR/ACT
     TUPMT
isp2 055       STOP    cr
```
Enter the commands in the Verifying the Gateway Screening Configuration section to verify that the screen being removed is not referenced by other screens in the database.

If the screen being removed is referenced by other screens, perform the procedures shown in the Gateway Screening Configuration Procedures section to change the NSFI of those screens to reference other screens or change the NSFI of these screens to STOP.
Remove the allowed ISUP screen from the database using the dlt-scr-isup command.
The current value of the isupmt parameter must be entered exactly as shown in the rtrv-scr-isup output in step 1. For this example, enter this command.

dlt-scr-isup:sr=isp2:isupmt=055

A message similar to the following should appear.
```
rlghncxa03w 06-10-25 15:26:30 GMT  EAGLE5 36.0.0
DLT-SCR-ISUP: SCREEN SET AFFECTED - FLD5  0% FULL
DLT-SCR-ISUP: MASP A - COMPLTD
```
Verify the changes using the rtrv-scr-isup command with the screening reference name used in step 3.
For this example, enter this command.

rtrv-scr-isup:sr=isp2

The following is an example of the possible output.
```
E2573 Cmd Rej: SR or NSR does not reference an existing SR
```
This message shows that the specified screening reference name is not in the database and the action of the dlt-scr-isup command in step 3 was successful. If the specified screening reference name contained more than one entry when the dlt-scr-isup command was executed in step 3, the rtrv-scr-isup:sr= command output would show the remaining entries in the screening reference instead of error message E2573.

Backup the new changes using the chg-db:action=backup:dest=fixed command.

The following messages should appear, the active Maintenance and Administration Subsystem Processor (MASP) appears first.

BACKUP (FIXED) : MASP A - Backup starts on active MASP.
BACKUP (FIXED) : MASP A - Backup on active MASP to fixed disk complete.
BACKUP (FIXED) : MASP A - Backup starts on standby MASP.
BACKUP (FIXED) : MASP A - Backup on standby MASP to fixed disk complete.

Figure 14-4 Removing an Allowed ISUP Message Type Screen