So our phone system people are trying to setup a SIP trunk on our Mitel 3300 unit. I open up firewall ports and setup 1:1 NAT for the PBX's IP, everything looks like it should be OK. They are telling ...

In our last VoIP installment, we looked at the main reasons why SIP has become a widely adopted protocol, but we left details of the protocol’s inner workings fairly vague. This article will drill ...

Session Initiation Protocol (SIP) is inherently simple. It is readable, meaning that with a probe you can follow the session initiation by simply reading the messages as they travel between two ...

Discover the differences between SIP vs VoIP and why those differences don’t really matter that much during the buying process. SIP vs VoIP is a common question, but it’s not going to help you during ...

Chances are, your users haven't heard of Session Initiation Protocol (SIP) outside of any meetings you may have had with them concerning your company's telecommunications. But, in fact, SIP is ...

Every company, no matter the size, needs a robust communications platform. The top voice over IP (VoIP) services we've tested deliver enterprise-grade phone system features for a ...

We are becoming less and less dependent on mobile networks. You can get a data signal almost everywhere that you can get a mobile signal and most of us are around WiFi most of the time anyway.

Even many IT professionals haven't heard of the Session Initiation Protocol (SIP), so it's almost certain your users haven't. However, unless you're using an entirely proprietary Voice-over-IP (VoIP) ...

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 ...