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Summary of MFC/R2.
MFC – Multi Frequency Compelled. This is a mechanism whereby audio tones are sent down telecommunication circuits in
order to convey signalling information.R2 – R2 simply refers to Region 2 and R1 is Region 1. Nowadays, protocols have evolved and
been renamed, so the term “R2” is most-commonly used as a nickname for the protocol properly known as
MFC/R2. The term “R1” is not commonly heard at all anymore, certainly not when describing protocols.MFC/R2 stands for MultiFrequency Compelled/Region 2. Commonly called R2, this protocol is over 60 years old, and used to be a very common signalling mechanism throughout most of the international public telephone
networks.Previous update was done to support this community to understand MFC / R2 signalling. I have seen several threads regarding Line and Register based sinalling systems based on R1 / R2, DC10, AC9, etc..
For background with these analog signalling feel free to raise your questions.
Since CCITT No 7 (Red, Blue and White books) the Network signalling is now advanced to cater for PAN Network services as opposed to the traditional POT Services.
DC signalling has its origins way back in telephony. Battery signalling was extensively employed in early manual systems as a method of interconnecting
switchboards. For CPE to access Switching resources DC Line Signalling was a main staple. Now we have MF4. The last “mile” of the local loop is the last part of a Digital Network that is analogue. End to end ISDN was an earlier attempt to have a full Digital Network.
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