Stack Overview SS7 Overview Specification Packaging Support Custom Development

Stack Dynamics SS7 Stack SS7 Overview Signalling System 7 (SS7) is a multi-layer communications protocol designed for use in digital telephony networks, both for call control signalling and for other types of information transfer. The lower layers provide basic communications services. Message Transfer Part Level 2 (MTP-2) is the lowest layer of an SS7 software stack. It provides reliable message transfer between two adjacent points in an SS7 network. Message Transfer Part Level 3 (MTP-3) is the next layer up. It builds upon MTP-2 to provide reliable message transfer between any two points, not necessarily adjacent, in an SS7 network. The upper layers provide increasingly specialised applications services. The ISDN User Part (ISUP) provides call control and other services for ISDN calls. The Signalling Connection Control Part (SCCP) and Transaction Capabilities Application Part (TCAP) together provide support for Intelligent Networking services such as credit card validation services, number portability and mobile telephony.   For further information on this product please contact: Colin Chambers colinchambers@stackdynamics.com +44 (28) 9752 8617