Update: We're in the last throes of winter break 2019, which means most Ars' home office phones can stay dormant for a few more days. As such, we've been resurfacing a few classics from the ...

In Part 1 of our SIP primer, I covered the SIP foundation layers starting from the message structure and ending with the SIP transactions. We saw how phone registrations and proxies could work using ...

VoIP technology uses a broadband internet connection to transmit phone calls. Learn VoIP's features and everything you need to know to implement VoIP.

Cyber-attacks using the VoIP protocol Session Initiation Protocol (SIP) have been growing this year accounting for over 51% of the security event activity analyzed in the last 12 months, according to ...

One reason analog telephones are still around is that you can buy an inexpensive model, plug it in and begin making calls right away. When was the last time you were able to do that with a new IP ...

Some cavalierly refer to IP telephony as “just another application” that rides over your data network. But wait and see what happens if VoIP call quality starts eroding or, worse yet, if your ...

Testing your VoIP security system against all the threats that exist on the network can be a full time job. This guide documents how a VoIP system can be tested and suggest some of the available tools ...

Testing your VoIP security system against all the threats that exist on the network can be a full time job. This guide documents how a VoIP system can be tested and suggest some of the available tools ...

If you need a phone service but don’t want to deal with an antiquated and expensive landline, you might want to consider a VoIP system. These services allow you to make calls over the internet from ...

Several critical vulnerabilities have been discovered in voice over Internet Protocol (VoIP) and videoconferencing products based on the H.323 protocol that’s used in IP telephony applications to ...