telefennät
Telefennät is the Finnish term for the telephone network, the system of interconnected facilities that enables voice communication over distance. It traditionally includes the public switched telephone network (PSTN) as well as private networks connected to it, with the aim of providing reliable, orderly paths for calls and standardized signaling.
The network emerged from early telegraph systems and expanded with the first telephone exchanges. Operators manually
Infrastructure comprises access networks that reach end users, local switching centres, and trunk networks linking exchanges
In recent decades, the telefennät has become increasingly digital and converged with data networks. Voice over