What's the difference between VoIP and IP Telephony?

We found the answers from several different sources....

From Avaya:

VOIP and IP Telephony are closely related. IP Telephony is DEPENDENT upon VoIP.

VoIP delivers conversations over an IP network. IP telephony services can provide the means to manage the traffic, assure the quality of the conversation, enable the end user to control the calls with advanced business features that they have grown accustomed to using at work, then the enterprise will not be pleased with the VoIP experience.

IP Telephony facilitates the delivery of voice packets across the network with speed, plenty of options, and gives the caller control over the experience.

IP Telephony unites an organization's many locations - including mobile workers - into a single converged network. It provides cost savings by combining voice and data on one network that can be centrally maintained, as well as by eliminating toll expenses for calls between locations. Avaya Services help companies select the right solutions, assess the readiness of their LAN or WAN to carry voice traffic, implement the solutions, and maintain them after installation.

We also posed the question in the newly relaunched ask.com. Here was the top response, a post on a bulletin board on a student's website:
Voice over IP and IP telephony are terms used generally to describe the same type of technology; passing packetized voice traffic over IP networks. IP telephony can also represent the practice of passing traditional voice service traffic over packet networks, such as call centers, voice mail, caller ID and ANI, and others.

Lastly, we posed the question on Yahoo's new "Answers" service. We'll post the answers as we receive them in our email...