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International telecommunication over IP-based networks

The spaceship named InterNet Phone has landed. Communication technologies, as an economic fact, are no longer reserved to enterprises only, also private users takes profit from Voice over IP (VoIP). The trend to more convergence can't be stopped.

That applies also for merging regular phone line (PSTN, Public Switched Telephone Network) with InterNet Phone, which shows up in new devices.

VoIP Service Provider

Even if SIP (Session Initiation Protocol) has become the standard protocol for InterNet Phone, users only gets connected along with service providers, same way as regular phone users have to do, too.

VoIP service providers provide a gateway from the Internet to the PSTN and vice versa, that allows you to connect to both. The ENUM (Telephone Number Mapping) service lists users like a telephone book (YP, Yellow Pages) does and wipes out any borders between Internet Phone and regular phone line. The users can be called at each place of the world with this call number from the regular phone net, in addition, they can call to regular phone lines, too.