SUA (SCCP User Adaptation) Protocol

SUA transports any SS7 SCCP signaling messages over IP using SCTP, and is used between a Signaling Gateway and a signaling end point or between signaling end points.

SUA is used to direct queries to the correct IP-based Application Server Process. It replaces the SCCP layer with its own SUA layer and is used when source and destination are both IP.

A Signaling Gateway can determine the “next hop” using the Global Title Translations delivered in the Called Party Address of the Message Signaling Unit (MSU).

Note:

A-links for nodes requiring in-sequence delivery of messages should be configured on the IPLIMx card using M2PA; SUA does not have sequence numbers to support lossless changeover/changeback. For more information on the IPLIMx application, see IPLIMx, IPGWx and IPSG applications.

Routing keys are supported by the SUA protocol as in M3UA. Routing key parameters include DPC, OPC, SI, and SSN.

IPSG does not support SUA.