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Class 3 service builds upon Class 2, but also allows for expedited (urgent) messages to be sent and received, and for errors in sequencing (segment re-assembly) to be detected and for SCCP to restart a connection should this occur.
==Transport over IP
In the [[SIGTRAN]] suite of protocols, there are two primary methods of transporting SCCP applications across [[Internet Protocol]] networks: SCCP can be transported indirectly using the [[M3UA|''MTP level 3 User Adaptation'' protocol (M3UA)]], a protocol which provides support for users of [[Message Transfer Part|MTP-3]]—including SCCP. Alternatively, SCCP applications can operate directly over the ''SCCP User Adaptation'' protocol (SUA) which is a form of modified SCCP designed specifically for use in IP networking.
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