In this section
The following table lists and describes the SCCP GT primitives supported by the DSC Platform.
SCCP GT Primitives
| Message Type | Direction | Description |
|---|---|---|
| Response | Error response used by the SCCP GT application in response to an unroutable N-GT-UNITDATA indication. | |
| Request/Indication/ Response | Transfer Unit Data messages (UDT or XUDT). | |
| Request/Indication | Transfer Unit Data Service messages (UDTS or XUDTS) which indicates the failure of the associated Unit Data message. |
N-GT-ERROR
This primitive is used by the SCCP GT application to report errors in the Global Title Translation (GTT) to the originator. The following table lists and describes the N-GT-ERROR parameters.
N-GT-ERROR Parameters
| Parameter | Response | Description |
|---|---|---|
| SCCP-GT-ERROR-CODE | M | Translation result status. For more information on return cause values, see Q.713 and GR-246-CORE. |
| SCCP-ORIGINAL-MESSAGE-ID | M | The original message type of the incoming GT message. |
| SCCP-ROUTING-LABEL | M | MTP3 routing label. |
| SCCP-CALLED-ADDR | M | Called party address. |
| SCCP-CALLING-ADDR | M | Calling party address. |
| SCCP-USER-DATA | M | User data (payload) |
| SCCP-QUALITY-OF-SERVICE | O | Quality of service. |
| SCCP-GWS | O | Gateway screening. |
| SCCP-MSU-TRACE | O | MSU tracing. |
| SCCP-SEGMENT-TOTAL | O | Number of segments received at SCCP to form unit data messages |
| SCCP-HOP-COUNTER | O | Hop counter for XUDT messages only. |
| SCCP-SEGMENTATION | O | Segmentation for XUDT messages only. |
| SCCP-ISNI | O | For XUDT in ANSI only. See GR-246-CORE. |
| SCCP-MTI | O | ANSI only. See GR-246-CORE. |
| SCCP-INS | O | ANSI only. See GR-246-CORE. |
| SCCP-IMPORTANCE | O | ITU only. See Q.713. |
N-GT-UNITDATA
This primitive is used to send Unit Data (UDT) and Extended Unit Data (XUDT) messages. The indication messages are sent from SCCP while the response messages are returned to the GT application by SCCP on routing failure of a request. The following table lists and describes the N-GT-UNITDATA parameters.
N-GT-UNITDATA Parameters
| Parameter | Req | Ind | Resp | Description |
|---|---|---|---|---|
| SCCP-GT-DESTINATION-LIST | M | N/A | N/A | Lowest cost ordered list of destinations for the message. |
| SCCP-CALLED-TRANSLATED | O | N/A | N/A | Translated called party address as provided by the GT application. |
| SCCP-CALLING-TRANSLATED | O | N/A | N/A | Translated calling party address as provided by the GT application. |
| SCCP-CALLED-ADDR | M | M | M | Called party address. |
| SCCP-CALLING-ADDR | M | M | M | Calling party address. |
| SCCP-GWS | O | O | O | Gateway screening. |
| SCCP-MSU-TRACE | O | O | O | MSU tracing. |
| SCCP-SEGMENT-TOTAL | O | O | O | Number of segments received at SCCP to form unit data message. |
| SCCP-PROCESSING-FEATURES | O | N/A | O | SCCP GT application processing features. |
| SCCP-ECHO-DATA | O | N/A | O | SCCP GT application opaque data. |
| SCCP-REASON-FOR-RETURN | N/A | N/A | M | The reason for the return of the message to the SCCP GT application. |
| SCCP-ROUTING-LABEL | M | M | M | MTP3 routing label. |
| SCCP-QUALITY-OF-SERVICE | M | M | M | Quality of service. |
| SCCP-USER-DATA | M | M | M | User data (payload). |
| SCCP-HOP-COUNTER | O | O | O | Hop counter for XUDT messages only. |
| SCCP-SEGMENTATION | O | O | O | Segmentation for XUDT messages only. |
| SCCP-ISNI | O | O | O | For XUDT in ANSI only. See GR-246 CORE. |
| SCCP-MTI | O | O | O | ANSI only. See GR-246-CORE. |
| SCCP-INS | O | O | O | ANSI only. See GR-246-CORE. |
| SCCP-IMPORTANCE | O | O | O | ITU only. See Q.713. |
N-GT-NOTICE
This primitive is used to send UDTS and XUDTS messages. The request is sent by the GT application. The indication is sent by SCCP. The following table lists and describes the N-GT-NOTICE parameters.
N-GT-NOTICE Parameters
| Parameter | Req | Ind | Description |
|---|---|---|---|
| SCCP-GT-DESTINATION-LIST | M | N/A | Lowest cost ordered list of destinations for the original message. |
| SCCP-CALLED-TRANSLATED | O | N/A | Translated called party address as provided by the GT application. |
| SCCP-CALLING-TRANSLATED | O | N/A | Translated calling party address as provided by the GT application. |
| SCCP-CALLED-ADDR | M | M | Called party address. |
| SCCP-CALLING-ADDR | M | M | Calling party address. |
| SCCP-REASON-FOR-RETURN | M | M | Reason for return. |
| SCCP-USER-DATA | M | M | User data usually consisting of a TCAP message. |
| SCCP-ROUTING-LABEL | M | M | MTP routing label placed in the outgoing message. |
| SCCP-QUALITY-OF-SERVICE | M | N/A | Quality of service. |
| SCCP-GWS | O | O | Gateway screening. |
| SCCP-MSU-TRACING | O | O | MSU tracing. |
| SCCP-SEGMENT-TOTAL | O | O | Number of segments received at SCCP to form unit data message. |
| SCCP-PROCESSING-FEATURES | O | N/A | SCCP GT application processing features. |
| SCCP-ECHO-DATA | O | N/A | SCCP GT application opaque data. |
| SCCP-HOP-COUNTER | O | O | Hop counter for XUDT messages only. |
| SCCP-SEGMENTATION | O | O | Segmentation for XUDT messages only. |
| SCCP-ISNI | O | O | For XUDT in ANSI only. See GR-246-CORE. |
| SCCP-MTI | O | O | ANSI only. See GR-246-CORE. |
| SCCP-INS | O | O | ANSI only. See GR-246-CORE. |
| SCCP-IMPORTANCE | O | O | ITU only. See Q.713. |
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