THE SS7 TOPOLOGY
Figure B-3 depicts a typical SS7 topology. The subscriber lines are connected to the SS7 network through the Service Switching Points (SSPs). The SSPs receive the signals from the CPE and perform call processing on behalf of the user. SSPs are implemented at end offices or access tandem devices. They serve as the source and destination for SS7 messages. In so doing, SSP initiates SS7 messages either to another SSP or to a signaling transfer point (STP).
The STP is tasked with the translation of the SS7 messages and the routing of those messages between network nodes and databases. The STPs are switches that relay messages between SSPs, STPs, and service control points (SCPs). Their principal functions are similar to the layer-3 ...
Get Voice Over IP now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
