PSTN
From Pbxnsip Wiki
PSTN stands for "Public Switched Telephony Network" (see http://en.wikipedia.org/wiki/PSTN). In short words, this is the public telephone system that uses "old" technology to transport the signals.
PSTN stands for "Public Switched Telephony Network" (see http://en.wikipedia.org/wiki/PSTN). In short words, this is the public telephone system that uses "old" technology to transport the signals.