Update: this post contains corrected information, based on additional data sent to us by Keynote Systems.
For its "Keynote VoIP Competitive Intelligence Study," Keynote tested VoIP services from Vonage, AT&T CallVantage, Lingo, Packet 8, Verizon and Skype. VoIP-to-PSTN and PSTN-to-PSTN calls were tested, but VoIP-to-VoIP calls were not.
The study was based on
user feedback, not on technically tested performance metrics, involving 160,000 users. The results should cause users and service providers at least some pause.
The study results will be discussed tomorrow during a free webinar hosted by TMCnet. The webinar takes place tomorrow (Tuesday, July 12), at 1 p.m. ET, and will feature Dharmesh Thakker, Senior Product Manager for Service Level Management Solutions at Keynote, along with TMCnet publisher Rich Tehrani.