Today, we’d like to get back to a few basics about the relationship between the public-switched telephone network and voice over IP. The PSTN includes a signaling system, a series of central offices ...

I am trying to integrate VoIP into my existing PBX system. I have a Talkswitch 48CVA which supports both PSTN and VoIP lines. My main phone number is a landline which forwards calls to my VoIP line ...