Because of the bandwidth efficiency and low costs that VoIP technology can provide, businesses are gradually beginning to migrate from traditional copper-wire telephone systems to VoIP systems to reduce their monthly phone costs.

VoIP solutions have evolved into "unified communications" services that treat all communications - phone calls, faxes, voice mail, e-mail, Web conferences and more - as discrete units that can all be delivered via any means and to any handset, including cell phones.

VoIP runs both voice and data communications over a single network, which can significantly reduce infrastructure costs. The prices of extensions on VoIP are lower than for PBXs and key systems.

VoIP devices have simple, intuitive user interfaces, so users can often make simple system configuration changes. Dual-mode cell phones enable users to continue their conversations as they move between an outside cellular service and an internal Wi-Fi network, so that it is no longer necessary to carry both a desktop phone and a cell phone. Maintenance becomes simpler as there are fewer devices to oversee.