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Dialogic® Distributed Signaling Interface (DSI) - Signaling and SS7 Products

DSI SCCP 'Return Messages on Error' and 'Flow Control' options

This article provides information on how to configure the 'Return Messages on Error' options and the 'Flow Control Class' at the Dialogic® Distributed Signaling Interface (DSI) SCCP Layer when using the DSI MAP protocol above the DSI SCCP Layer.

When interfacing directly to SCCP, the SCPPN_RET_OPT and SCPPN_FLOW_CNTRL options can be set in the message sent into SCCP.

Theseare the parameters in question, taken from the Dialogic® DSI SCCP Programmer’s Manual:

Parameter name:  SCPPN_RET_OPT
Parameter length: Fixed, set to 1
Parameter data:  Single octet set to either 0 or 1 as follows:
0 = Discard Message on error
1 = Return Message on error

Omitting the return option parameter is equivalent to selecting Discard Message on error.
 
Parameter Name:  SCPPN_FLOW_CNTRL
Parameter Length:  Fixed: set to 1
Parameter Data:  Controls the level of service during connection orientated operation. Single octet coded as follows:
0 = Use class 2 service, flow control is not required.
1 = Use class 3 service, flow control is required.

Omitting this parameter is equivalent to selecting Use class 2 service; flow control is not required.

 
In most circumstances, another Dialogic® DSI signalling protocol, such as MAP, is running above the Dialogic DSI SCCP implementation. In this case, the application needs to send the appropriate values to DSI MAP to ensure that the correct values are passed down the stack to DSI SCCP.

The MAP quality of service parameter (MAPPN_qos) allows the user to provide this information in the dialogue primitive messages which the application sends in to MAP. Here are the details of the MAPPN_qos parameter, taken from the Dialogic® DSI MAP Programmer’s Manual:

Parameter name:  MAPPN_qos
Parameter data:  The octet is an indicator octet. The coding is as follows:
bit 0 - Set to 1 if the Return Option is selected.
bit 1 - Set to 1 if Sequence Control is required.
 
Bit 0 specifies if the 'Return Message on Error' option is selected. This is the equivalent of setting the SCPPN_RET_OPT to 1.
Bit 1 specifies if class 3 service should be used, providing flow control. This is the equivalent of setting the SCPPN_FLOW_CNTRL option to 1.

Glossary of Acronyms / Terms

MAP – Mobile Application Part
SCCP – Signalling Connection Control Part
TCAP – Transaction Capabilities Application Part






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