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 ...

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 ...

What's VoIP's Big Security Problem? SIP Session Initiation Protocol (SIP) is a must for voice over IP (VoIP) communication. But by itself, SIP is insecure and easily hacked. Here's what you need to ...

SIP session requests leverage the “session description protocol (SDP)” to define session characteristics such as media type, codec, and so on. While the IETF and SIPforum have standardized many of the ...

Interoperability is the biggest challenge in achieving a successful UC deployment, according to 58% of IT professionals who participated in Nemertes’ research benchmark. Getting various legacy and new ...