Voice over frame relay vs. VoIP1

Our main transport between offices is via frame relay. In a situation where a company would link 10-20 PBX's and not use IP phones, is there an advantage of to voice over frame relay versus voice over IP?
One

    Requires Free Membership to View

    By submitting your registration information to SearchNetworking.com you agree to receive email communications from TechTarget and TechTarget partners. We encourage you to read our Privacy Policy which contains important disclosures about how we collect and use your registration and other information. If you reside outside of the United States, by submitting this registration information you consent to having your personal data transferred to and processed in the United States. Your use of SearchNetworking.com is governed by our Terms of Use. You may contact us at webmaster@TechTarget.com.

big advantage of running services over an IP network versus a frame relay network is that you can easily full-mesh an IP network. In your case, if you had 10 sites to fully-mesh, you would need 10 x 9 / 2 PVCs (45 PVCs) to fully mesh the network. In an IP network, you don?t have this problem. It is possible to route traffic thru fewer sites to avoid fully-meshing sites but unfortunately this causes you to inefficiently route traffic and potentially pay for carrying bits of information twice (or more).

This was first published in May 2002