Showing posts from January, 2009

SS7 Architecture

Below is a picture depicting the SS7 architecture.

With SS7, a packet data network overlays and controls the operation of the underlying voice networks, signaling information is carried on an entirely different path than voice and data traffic. Signaling in essence does not take a lot of time, hence it is possible to multiplex many signaling messages over one channel - and that's why the signaling system is a packet network.

SS7 entire architecture performs out-of-band signaling (in which conversation and signaling take over different paths). It (the architecture) defines the procedure for the setup, ongoing management, and clearing of a call, and it enables the passing along of customer-related information that helps in routing calls.

The key components of SS7 are:

1. SSP:Service-switching points
Them switches that originate and terminate calls. It serves as the source and destination point for the SS7 messages

2. STP: Signal transfer point
Responsible for translating the SS7 mess…