TAILIEUCHUNG - Signaling System No.7 Protocol Architecture And Sevices part 53

SCCP User Adaptation (SUA) SUA provides for the transport of SCCP user signaling (TCAP and RANAP) over IP using SCTP. In effect, it duplicates SCCP's services by providing support for the reliable transfer | SCCP User Adaptation SUA SUA provides for the transport of SCCP user signaling TCAP and RANAP over IP using SCTP. In effect it duplicates SCCP s services by providing support for the reliable transfer of SCCP user messages including support for both connectionless Class 0 and 1 and connection-oriented Class 2 and 3 services. SUA also provides SCCP management services to manage the status of remote destinations and SCCP subsystems. In addition in some configurations SUA also provides address mapping and routing functionality. SUA is currently defined by an Internet Draft ID 139 and is in the process of becoming an RFC. SUA can be used between an SG and an IP-based SEP or between two IP Signaling Points IPSP . Figure 14-16 shows an example of SUA transporting signaling information between an SG and an IP-based SEP. SUAP refers to any SCCP user such as MAP over TCAP. Figure 14-16. Use of SUA Between a SG and an IP-Based SEP With SUA an SG can act as an endpoint or a relay node. For the endpoint configuration the point code and SSN of the SCCP user on the IP-based SEP are considered to be on the SG. Therefore from the SS7 point of view the SCCP user on the IP-based Signaling Point is on the SG. When the SG receives an incoming message from the SS7 network it might have to perform Global Title Translation GTT on the message to determine its destination. When the SG acts as a relay node the SG must perform an address translation before it can determine the destination of incoming messages. This translation can be modeled on an SCCP GTT or based on hostname IP address or other information in the Called Party Address CdPA . Thus the determination of the IPbased SEP is based on the global title or other CdPA information in the SUA message. A hop counter is used to avoid looping refer to Chapter 9 Signaling Connection Control Part SCCP for more information . The SUA layer on the ASP must also make decisions about the distribution of outgoing messages. To make this decision .

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