1248 - GSM MAP Screening rcvd unknown originator

This message occurs when an MSU arrives with a SSN and MAP Op-Code that exist in the GSM SSN and MAP Op-Code tables, but the CGPA address does not exist in the GSM MAP Screening table or the CgPA address exists in the table but with an incorrect NPV/NAIV. In this case, the default action for the Op-Code applies.

Example

RLGHNCXA21W 00-11-18 18:59:23 EST EAGLE 35.0.0
0018.1248 CARD 1103 INFO GSM MAP Screening rcvd unknown originator
OPC=001-001-001
CDPA: NI=1 RI=0 GTI=04 SSNI=0 PCI=1
TT=250 NP=04 NAI=010 ADDR=123456789012345678901
PC=003-003-003 SSN=005
CGPA: NI=1 RI=0 GTI=04 SSNI=0 PCI=1
TT=100 NP=07 NAI=012 ADDR=012345678901234567890
PC=001-001-001 SSN=004
DATA=3a e2 38 c7 04 56 04 72 e0 e8 30 e9
2e cf 01 00 d0 02 83 01 f2 25 aa 0b
84 09 01 00 11 0a 19 49
Op-Code=61 Forbidden Param=N/A Action=Discard

Legend

ADDR: Address
CDPA: Called party address
CGPA: Calling party address
DATA: Hex dump of TCAP part of MSU
GTI: Global title indicator
NAI: Nature of address indicator
NI: Network indicator value
NP: Numbering plan
OP-CODE: Operation Code
OPC: Origination point code
PARAM: Parameter
PC: Point code
PCI: Protocol control information
RI: Routing indicator
SIO: Service information octet
SSN: Subsystem number
SSNI: Subsystem number indicator
TT: Translation type

Alarm Level: No alarm condition. The message is informational only.

Recovery

To prevent the GSM screening from disallowing this MSU, you can add the CgPA address to the GSMMAP or correct the CgPA address NPV or NAIV.
Alternatively, you may choose to disable MPS Screening on the specific linkset entirely.

In an emergency situation for example, you can prevent MAP Screening from occurring on any suspected linkset with the chg-ls:gsmscrn=off command. Using this command means no MAP Screening will be performed on any MSU arriving through the linkset, which results in UIM #1248 no longer appearing.
Another choice is to change the default action shown in the example.

It shows the Action=Discard for any MSU with Op-Code=61. This choice lets you set the default action to Pass; specify the command chg-gsms-opcode:opname= <insert the opname corresponding to the Op-Code> :ndfltact=pass. This action does not prevent UIMs from being reported, but it does prevent the specified Op-Code from being discarded.
If the frequency of UIM #1248 messages is distracting, you can limit the number of UIMs displayed per time interval for a specific UIM.

Use the command set-uim-acthresh:limit=1:intrvl=5:uimn=1248 to limit the output of UIM #1248 to one output every 5 minutes.

Note:
Use this suggestion sparingly, if at all. This action has value in temporarily suppressing a large volume of UIMs while diagnosing a MAP Screening situation.