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SCCP/GTT Signaling Gateway (SG Plus) Configuration, including M2PA, M2UA, M3UA and SUA

M3UA and SUA interworking to end nodes

In addition to M3UA (see SG configuration) the SG Plus supports SCCP (Signaling Connection Control Part) and the SUA (SCCP User Adaptation Layer) protocols. SS7 SCCP provides network services above MTP3 and is used as the transport layer for TCAP-based services such as freephone, calling card, local number portability, wireless roaming and PCS (Personal Communications Services). SCCP also provides the means by which an SG Plus can perform GTT (Global Title Translation) to enable the destination signaling point and SSN (Subsystem Number) to be determined from the signaling message.

SCCP Signaling Messages over IP

SUA is a SIGTRAN protocol for transporting SCCP signaling messages (e.g. TCAP) over IP using SCTP. SUA is used between a Signaling Gateway and an IP signaling endpoint, or between IP signaling endpoints. It supports unordered and in-sequence connectionless services, bi-directional connection-oriented services with or without flow control, and detection of message loss and out-of-sequence errors. SUA is a signaling solution for companies who are running SCCP on SS7 devices that need to connect to IP devices.

With the addition of SCCP/GTT, the SG Plus configuration provides more STP-like functionality and, together with the High Availability (HA) option, offers the fully redundant, distributed solution that is a must for high-end telecom companies.

ISUP Query Transmission via SUA	TCAP Query Transmission via SUA