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Phone calls between subscribers of the same provider are usually free when flat-fee service is not available.A Vo IP phone is necessary to connect to a Vo IP service provider.Third-generation providers, such as Google Talk, adopted the concept of federated Vo IP—which is a departure from the architecture of the legacy networks.These solutions typically allow dynamic interconnection between users on any two domains on the Internet when a user wishes to place a call.In addition to Vo IP phones, Vo IP is available on many personal computers and other Internet access devices.Calls and SMS text messages may be sent over mobile data or Wi-Fi.Full-service Vo IP phone companies provide inbound and outbound service with direct inbound dialing.
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.
Rather than closed architectures, these devices rely on standard interfaces.
Vo IP devices have simple, intuitive user interfaces, so users can often make simple system configuration changes.
Voice, and all other data, travels in packets over IP networks with fixed maximum capacity.
This system may be more prone to congestion than traditional circuit switched systems; a circuit switched system of insufficient capacity will refuse new connections while carrying the remainder without impairment, while the quality of real-time data such as telephone conversations on packet-switched networks degrades dramatically.