Congestion in networks that serve time-sensitive applications is an undesirable phenomenon. IP networks nowadays carry broadband voice and video. These applications have strict requirements regarding delay, delay variation and packet loss. Special, tactical measures need to be taken to fulfill those requirements. The only way to accomplish this is to avoid congestion in the network.

The […]

In my previous post I wrote about the Session Initiation Protocol as one of the choices for VoIP services. Today, I’ll introduce you to the other end of the specctrum, H.323, and let you make the decision for yourself.

The Need for an Internet Telephony Protocol Suite

The evolution of TDM telephony into Voice over IP required […]

What’s the Idea Behind the DiffServ Model?

Differentiated Services, also known as DiffServ, eliminate the need for per-flow state and signaling at every hop. The DiffServ architecture pushes all the complexity to the edge of the network and hence eliminates the overhead associated with per flow traffic handling in the core of the network.

This is exactly […]

Session Initiation Protocol (SIP) is a standard designed by the Internet Engineering Task Force (IETF) to serve VoIP services. It’s an application layer protocol that can operate over UDP (User Datagram Protocol) or TCP (Transmission Control Protocol). SIP, currently at version 2, is defined in RFC 3261.

Simplicity and flexibility are the primary characteristics of SIP. […]

As the pool of IT applicants continues to flood with newcomers, certification is one of the best ways to stay employed … and get ahead. But with so many certification paths to choose from it’s easy to take a wrong turn. If you are looking to add some meaningful and employable credentials to your resume, […]