> It's a very ancient system, much older than the internet. Actually, you could argue they're around the same age. ARPANET switched from NCP to TCP on 1 Januar

> It's a very ancient system, much older than the internet. Actually, you could argue they're around the same age. ARPANET switched from NCP to TCP on 1 January 1983 [1] and the initial SS7 standard was released by the ITU in 1988. [1] https://tools.ietf.org/html/rfc801 https://tools.ietf.org/html/rfc801