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Telecoms terms and abbreviations can be a little confusing, even for the most experienced engineers. Here’s a short glossary of some of the terms we use.


Region or Register Signalling
R2 or CAS signalling is still in common use today (most widely MFC R2), but has been superseded by other forms of signalling such as ISDN and SS7.
Real-time Transport Protocol
Proxy server for RTP streams, that is supported on SS7 Media Gateway and Class 4 Softswitch