VoIP vendors say they deliver scalability and security. And InteropLabs testing mostly proved them right in multivendor settings. But testing also revealed some implementation glitches in both of those areas, and pinpointed a few missing pieces when it comes to key exchange for securing VoIP traffic.
As long as Cisco Systems Inc. leads the router market, competitors will continue to come up with differentiators. With Adtran Inc.'s new NetVanta 4305 access router, the differentiators are price, price, price.