In this section
This section describes the parameters used by the SCCP GT interface.
The following table lists and describes the SCCP parameters used with only the SCCP GT interface. The descriptions of these parameters can be found in the following sections. The SCCP GT interface reuses parameters defined in the SCCP user interface (see SCCP User Parameters).
SCCP GT Parameters
| Parameter | Value | Version |
|---|---|---|
| SCCP-HOP-COUNTER | 27 | 1 |
| SCCP-SEGMENTATION | 28 | 1 |
| SCCP-ISNI | 29 | 1 |
| SCCP-INS | 30 | 1 |
| SCCP-IMPORTANCE | 31 | 1 |
| SCCP-MTI | 39 | 6 |
| SCCP-GT-ERROR-CODE | 128 | 1 |
| SCCP-GT-DESTINATION-LIST | 130 | 1,10 |
| SCCP-PROCESSING-FEATURES | 133 | 4 |
| SCCP-ECHO-DATA | 134 | 4 |
| SCCP-CALLED-TRANSLATED | 135 | 1 |
| SCCP-CALLING-TRANSLATED | 136 | 1 |
| SCCP-ORIGINAL-MESSAGE-ID | 137 | 1 |
SCCP-HOP-COUNTER
This single octet parameter has a value of 1 to 15. The value of the hop counter is decremented by each GTT following a successful translation.
SCCP-SEGMENTATION
This parameter indicates the segmentation information required for message reassembly. See Q.713 and GR-246-CORE for information about this parameter.
SCCP-ISNI
The Intermediate Signaling Network Identification (ISNI) parameter is only applicable to the American National Standards Institute (ANSI) standard. See GR-246-CORE for information about this parameter.
SCCP-INS
The Intermediate Network Selection (INS) parameter is only applicable to the (ANSI) standard. See GR-246-CORE for information about this parameter.
SCCP-IMPORTANCE
This parameter indicates the importance of messages as related to SCCP congestion and is only applicable to the International Telecommunication Union (ITU) standard. See Q.713 for information about this parameter.
SCCP-MTI
The Message Type Interworking (MTI) parameter is only applicable to ANSI XUDT(S) only. See GR-246-CORE for information about this parameter.
SCCP-GT-ERROR-CODE
This single octet parameter indicates the status of the GT translation. The parameter is a single octet as defined in GR-246-CORE for ANSI and Q.713 for ITU.
SCCP-GT-DESTINATION-LIST
This parameter contains the results of a GTT. This result provides a list of destination point codes and their associated costs and weights (version 9 and above).
In version 8 and below, the SCCP-GT-DESTINATION-LIST parameter is a multiple of five and contains a maximum of eight destinations and a minimum of one.
SCCP-GT-DESTINATION-LIST Version 8 and below
| Field Name | Offset | Description |
|---|---|---|
| PC | 0 to 3 | Destination Point Code 1 |
| Cost | 4 | Cost of routing to DPC 1 |
| PC | 5 to 8 | Destination Point Code 2 |
| Cost | 9 | Cost of routing to DPC 2 |
In version 9, the SCCP-GT-DESTINATION-LIST parameter is a multiple of six (includes additional weight information) and contains a maximum of 16 destinations and a minimum of one.
SCCP-GT-DESTINATION-LIST Version 9
| Field Name | Offset | Description |
|---|---|---|
| PC | 0 to 3 | Destination Point Code 1 |
| Cost | 4 | Cost of routing to DPC 1 |
| Weight | 5 | Weight based on cost of routing to DPC 1 |
| PC | 6 to 9 | Destination Point Code 2 |
| Cost | 10 | Cost of routing to DPC 2 |
| Weight | 11 | Weight based on cost of routing to DPC 2 |
In version 10 and above, the GT-DESTINATION-LIST parameter is a multiple of seven (includes additional NA information) and contains a maximum of 16 destinations and a minimum of one.
SCCP-GT-DESTINATION-LIST Version 10 and above
| Version 10 | ||
|---|---|---|
| PC | 0 to 3 | Destination Point Code 1 |
| Cost | 4 | Cost of routing to DPC 1 |
| Weight | 5 | Weight based on cost of routing to DPC 1 |
| NA | 6 | NA associated with DPC 1 |
| PC | 7 to 10 | Destination Point Code 2 |
| Cost | 11 | Cost of routing to DPC 2 |
| Weight | 12 | Weight based on cost of routing to DPC 2 |
| NA | 13 | NA associated with DPC 2 |
Note
In the unlikely event that the GTT and SCCP do not support version 10, the SCCP will use an NA value of 0 (PC LIST VALUE) for each PC-Cost-Weight combination for version 9 and below (where no NA information is provided in the GT_DESTINATION_LIST parameter) is received from GTT.
SCCP-PROCESSING-FEATURES
GT application processing features apply to DSC Platform SCCP GT applications requiring special management at SCCP. Currently, this parameter is a single octet where the first bit (LSB) identifies the “Return to application on error” feature.
This feature ensures if a destination is unavailable for a message incoming from the GT application, the message is returned to the application through a N-GT-UNIT-DATA-RSP.
The reminder of bits are reserved by setting them to 0.
SCCP-ECHO-DATA
GT application processing information is echoed back in a N-GT-UNIT-DATA-RSP if the Return to application on error processing feature is enabled in the SCCP-PROCESSING-FEATURES parameter.
SCCP-CALLED-TRANSLATED
This parameter shows the translated called party address as provided by the GT application (same format as SCCP-CALLED-ADDR).
SCCP-CALLING-TRANSLATED
This parameter shows translated calling party address as provided by the GT application (same format as SCCP-CALLED-TRANSLATED).
SCCP-ORIGINAL-MESSAGE-ID
This parameter shows the original message type of the incoming GT message in a N-GT-ERROR-RSP. The parameter values are either N-GT-UNITDATA-REQ or IND.
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