As VoIP continues to gather momentum, we're sometimes left wondering whatever happened to some of its earlier competitors.\u00a0 In this newsletter, we're going to address Voice over Frame Relay (VoFR) and next week we'll look at Voice over DSL (VoDSL).VoFR predates VoIP by several years.\u00a0 Back in 1997, the Frame Relay Forum (now the MPLS and Frame Relay Alliance) defined VoFR as a technology to pass low-bit-rate voice over frame relay PVCs.\u00a0 Interestingly, even though frame relay inherently has much lower latency and much better predictability that IP networks, VoFR was only moderately successful in the market and today it appears to be fading into the background.There are several reasons for this lackluster acceptance.\u00a0 First and foremost, VoFR's primary strength is transporting point-to-point voice as a replacement technology for traditional "tie lines."\u00a0 As such, voice can be transported very inexpensively, and the VoFR justification is a tariff arbitrage.\u00a0 However, as the price for voice has continued to plummet, VoFR - as well as VoIP - continues to be a tough sell if tariff arbitrage is the only factor.In contrast with VoFR, VoIP really began to excel as IP PBXes started to roll out. While VoFR using switched virtual circuits (SVC) could theoretically compete with VoIP, there are still few if any widespread frame-relay SVC services available.\u00a0 Additionally, VoIP, as we've often discussed, is becoming integrated into the entire IT infrastructure.\u00a0 By contrast, frame relay is appropriately limited to the WAN transport arena.Of course, depending on how you define VoFR, there are massive installations in place today.\u00a0 Frame relay is a major carrier for all types of IP traffic, including VoIP.\u00a0 However, the VoFR of today is VoIP over frame relay (VoIPoFR).***How is Web Conferencing being used? What are the most important features? Which are the most popular brands? Take a short survey and Wainhouse Research\u00a0 will send you a free high-level summary of the results. Here's your chance to influence vendors and service providers - who very much want to know how you feel - and win one of several Amazon gift certificates (up to $1,000) for your time. Visit https:\/\/www.wainhouse.com\/webmetrics\/survey to take the survey.