SCCP SCLC Configuration Bytes

Byte | Description | Value
--- | --- | ---
0x01 | SCCP Message Format | 0x00- International (default for ITU) 0x01=National (default for ANSI) 0x02=China Spec (same as ITU except the point code is 24 bits
0x02 | UDTS Message Priority (ANSI Only) | 0x02
0x03 | N-Unidata * | 0x00 - N-Unidata as UDT (Default) 0x01 - N- Unidata as XUDT
0x16-0x19 | Used to store the X value. | 150 (default)
0x20-0x1D | Used to store the Y value. | 200 (default)

* The SCCP user sends SCCP N_UNITDATA to request sending data to a remote SCCP mode. The SCCP then packs the information in N_UNITDATA into an SCCP message and sends the message. The format of the message could be UDT or XUDT.

The XUDT message can be used with GTT to validate the hop counter to detect possible traffic loops. The maximum hop counter is set to 15. We recommend that if you use GTT and if the network supports XUDT, then you should set this SCLC configuration byte 3 to 0x01 to use XUDT message.

This configuration byte only applies to the messages without segmentation. If segmentation is needed, the SCCP will automatically pack and send the XUDT with the segmentation optional parameter.

International Telecommunications Union (UN)
American National Standards Institute. ANSI administers and coordinates the U.S. voluntary standardization and conformity assessment system for the
telecommunications industry. More details on these standards may be
viewed at www.ansi.org.