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Making the Switch to VoIP

Voice over IP (VoIP) is making a comeback after a few years on the back burner.

Everywhere you turn it seems there is another ad for Vonage (a VoIP-based phone service that uses your broadband connection to save money on calls). Even the traditional telephone and cable companies are starting to push the service. The technology of VoIP itself is not new -- telephone companies have been using it in their own backbone for years. What is new is rolling the service out to the end users.

But there is another aspect of VoIP that is more important from an enterprise standpoint. Replacing existing internal phone systems with VoIP networks can cut costs, simplify administration and enable a variety of new applications which improve collaboration and productivity.

From Analog to Digital

VoIP represents the latest in a long series of actions to change voice transmission from an all-analog to an all-digital process.

The analog system has a tremendous quality of service built in. It assigns a dedicated end-to-end connection for each pair of users, with separate channels to allow simultaneous two-way transmission. Those lines could carry a lot more than just two people's voices but they don't, thereby wasting a lot of potential bandwidth. Standard phone service is like having your own limo waiting outside your door with the motor running ready to take you anywhere on a moment's notice. It is very good service, but also not very efficient.

VoIP, on the other hand, allows many voice transmissions to pass over the same piece of copper or fiber by dividing the communications into packets and then routing these packets, mixed in with those from other users, to the other person in the conversation. VoIP is like having a fleet of shared taxicabs. It makes very efficient use of the available resources, but you still may end up standing in the rain trying to catch a ride.

IP networks, after all, were not designed with the same quality of service in mind as phone systems. In fact, the architecture anticipates that some packets will get lost or delayed along the way and contains procedures to request the retransmission of any missing packets. From a data standpoint, this may mean that the user has to wait an extra second or two for a web page to download.

But voice transmissions can't work that way. To be effective, it requires a continuous stream of data. You can't have a random series of three-second delays happening in the middle of a sentence and still have an effective conversation. This proved to be a major barrier to the widespread adoption of VoIP.

To guarantee an adequate level of service, the International Telecommunications Union (ITU) has approved standard H.323 which sets out standards for voice, video and data. The implementation of H.323 by manufacturers and carriers brings VoIP quality up to the level of older switched networks and opens the door for its widespread adoption.

Phasing It In

The aspect of VoIP being widely promoted right now is using an Internet connection to replace traditional phone lines. From an IT standpoint, however, what is important is how it can facilitate internal communications. To begin with, it means only one set of wires that have to be strung to the desktop since the computers and phones will both just be nodes on the same network. It also means that staff only needs to support a single transmission protocol.

The real value, however, will be in the area of converged applications that VoIP enables.

"In two years we will be seeing a critical mass of applications in this area," says Gartner vice president Jeff Snyder. "These applications are what are going to make the compelling argument for switching to IP Telephony."

First of all, it brings voicemail, e-mail and faxes into a common inbox where they can be deleted, answered, forwarded or saved. They also provide presence management -- the ability to see who else is logged onto the network at the time.

In a call center or help desk situation, for example, an analyst or agent can then escalate a call simply by finding who else is available and transferring both the caller and all supporting data or documents to that employee. This reduces the number of callbacks and improves customer service.