SCCP quality of service (QOS)

The TCAP layer uses the SCCP connectionless transport service to deliver transaction messages to their destinations. With this service, three additional quality of service options are available to the application:

Quality of service option

Description

Message priority

The application can assign a priority of 0 (lowest priority) through 3 (highest priority).

Return option

Allows the calling application to request that messages (transaction requests) that cannot be delivered are returned to the application with a TCAP status indication message. By default, undeliverable messages are discarded by the SCCP layer without notifying the sending application.

Sequential delivery

The application can request that consecutive transaction requests are delivered in order. This might be required if an application sends multiple transaction messages without waiting for a response to the first transaction request. When this option is selected, TCAP uses the SCCP class 1 connectionless service. By default, TCAP uses the SCCP class 0 service, which has no guarantee of delivery order.


Refer to the NMS SCCP Developer's Reference Manual for information about SCCP.