public networks, it is currently difficult to guarantee Quality of Service (QoS). Better service is possible with private networks managed by an enterprise or by an Internet telephony service provider (ITSP). As of this writing, VoIP is still plagued by lack of generally accepted interoperability standards. 3.6 User Reviews A Vonage User Review See this thread for one user's review of Vonage. A Packet8 User Review See this thread for one
