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"illegal GTI value" Error is Reported by the M3UA Interface (Doc ID 1435134.1)

Last updated on DECEMBER 14, 2017

Applies to:

Oracle Communications Network Charging and Control - Version 4.3.0 and later
Information in this document applies to any platform.

Symptoms

On all versions of Oracle Communications Network Charging and Control (OCNCC or NCC), the following error can be thrown by the Message Transfer Part Level 3 (MTP3) User Adaptation (M3UA) Interface (m3ua_if):

Mar 5 10:42:05 slc01 m3ua_if: [ID 675952 user.error] m3ua_if(1234) ERROR: {401018} sctp:sg2_sig1:1234:slc01_sig1:1234: Invalid SCCP UDT packet: illegal GTI value

This error message can be observed in the syslog (usually located at /var/adm/messages) of the Service Logic Controller (SLC).

The behavior was observed for the M3UA interface.  Note that it may be that the issue (although not observed in this problem's investigation) is not limited to M3UA but may also apply to the SCCP User Adaptation (SUA) Interface (sua_if) as well. 

Upon inspecting the snoop traces, the messages coming in with a Global Title (GT) Indicator (GTI)'s 8th bit set to 1 are being dropped and the call is not processed.

For further notes about the Signaling Connection Control Part (SCCP) protocol, please refer to Q.713 specification from the ITU-T. This document is available from ITU's website.

Changes

New NCC integration to a new National Network.

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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