"Typically, the quality for consumers using VoIP really isn't there yet," Phil Solis, analyst for ABI Research, said. "On a good day, it may sound fine. But on a typical day, if there's lots of Internet traffic, you might have latency and jitters. Your call can range in sound from pretty OK to low-volume garble."
Nevertheless, manufacturers are adding VoIP support in handsets for people looking to save minutes on subscription plans by making calls through Wi-Fi hotspots, which are wireless Internet connections popping up in airports, cafes, hotels and other public places. Even this use, however, is expected to be limited.
"The typical consumer has a pretty big bucket of minutes now, so it wouldn't be a really big savings," Solis said.
Among the manufacturers selling VoIP phones on Windows CE is Inter-Tel Integrated Systems Inc., which recently shipped the Inter-Tel Model 8690.
VoIP features Microsoft plans to include in Windows CE 5.0 are multiparty audio conferencing, Exchange Server integration with contact search and calendar capabilities and unified messaging.