In our recent series on ISDN, we mentioned in our discussion of the E-1 version of an ISDN Primary Rate Interface that one of the 32 DS-0s was already used for control purpose, so there were only 31 ...

Some people may say that ISDN is dead, but that’s news to the millions who rely on ISDN Primary Rate Interface service for connecting PBXs and dial-up modem banks to the public network. While it’s ...

Where can I learn about the fundamentals of ATM and ISDN and can you explain why they are used? Integrated Services Digital Network (ISDN) is a 90's network technology that transmits digital signals ...

Are SIP trunks as reliable as an ISDN PRI T1? I’m asked this question a lot, so I thought it’d be a great blog topic. I don’t think you are as concerned with this as the amber lights in the server ...