PSTN was originally used for traditional phones, but with fiber optics replacing copper wires, it is also used for internet telephony calls. Check out the difference between VoIP and PSTN systems.
The uploaded content will be moved to this newly created album. You must create an account or sign in if you want to edit this album later on.
Prijavite grešku
Podijeli
__privacy_notes__
We use our own and third party cookies to improve your browsing experience and our services. If you continue using our website is understood that you accept this cookie policy.