Controlling ISUP congestion

The ISUPEVN_CONG event indicates one of the following congestion issues:

In either case, you receive a congestion level of 0 - 3 in the value element of the CTA_EVENT structure.

If your application receives a level one event, reduce the number of calls being generated. At levels two and three, avoid all new calls and clear existing calls. As memory usage lowers or the outbound queue shrinks, congestion events with lower congestion levels are generated for the application to resume normal traffic.

If your application requires additional information about the congestion, call ISUPGetApiStats.