Talk:Signalling System 7
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It is my understanding that SS7 relates to the ANSI standard while C7 relates to the ITU standard. Although with many things in common they are diferent in for example things as the addressing space.
Re: SS7 vs. C7
I believe SS7 and C7 to be synonyms. Often you will also find CCS7 for "Common Channel Signaling (System) 7". But yes, there are certain subtle differences wrt. e.g. lenghts of certain protocol fields such as CIC.