VoIP for Dummies Book - XO Communications

In addition, the organization can begin to develop integrated
data, voice, and video applications. Most if not all of the call features
described in Part I become available across the enterprise.
As the higher recurring costs of running separated networks
are driven out of the budget, more operating revenues are
made available for other business needs. As the organization
deploys and leverages its IP infrastructure, it positions itself
to integrate new applications as they become available.
Getting there: Converged
Communications Phase
As enterprises become more distributed and business performance
needs dictate enhanced user capabilities, converged
communications applications are deployed. Converged communications
lead to increased flexibility and cost efficiency due
to modularization of components and applications. As solutions
become more modular, their services can be deployed in
a greater number of configurations and more easily integrated
into multi-vendor environments.
Improving Quality of
Service with VoIP
Part III: Three Phases to VoIP Migration 39
With traditional telephony, every call is given a dedicated
channel for the length of the call. Although this setup contributes
to high call quality, bandwidth utilization is low and
calls are blocked when the network cannot find a full bandwidth
channel available. Somewhere along the line, the folks
running the PSTN decided that a breakdown in connectivity
was preferable to a breakdown in quality — an expensive
problem that VoIP services fix.
Coping with packet problems
When considering telephone quality of service (QoS), toll quality
means the highest level of service. VoIP service can meet
or beat traditional toll QoS if your communications provider
has built and operates your service to the right standards.