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Dual-mode 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.
Early providers of voice-over-IP services offered business models and technical solutions that mirrored the architecture of the legacy telephone network.
Skype, which originally marketed itself as a service among friends, has begun to cater to businesses, providing free-of-charge connections between any users on the Skype network and connecting to and from ordinary PSTN telephones for a charge.
In the United States the Social Security Administration (SSA) is converting its field offices of 63,000 workers from traditional phone installations to a Vo IP infrastructure carried over its existing data network.
Second-generation providers, such as Skype, built closed networks for private user bases, offering the benefit of free calls and convenience while potentially charging for access to other communication networks, such as the PSTN.
This limited the freedom of users to mix-and-match third-party hardware and software.