That is why, in four years, as little as 10% of phone systems may be IP-based, Gartner Group says.

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They assume a future in which all regulatory differences between IP-based and traditional circuit-switched phone services have been eliminated.

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Users will be able to make and receive calls from their Bluetooth-enabled mobile, Cisco Unified IP Phone, Cisco Unified Wireless IP Phone or Cisco Cius and can switch among the endpoints as they change location.

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The delivery of voice calls using VoLTE is similar to the voice over IP, or VOIP, phone services offered by many cable and Internet-service providers.

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The company saw a 14.3% drop in primary residential switched-access phone lines, as consumers continued to move toward voice over IP and mobile devices for most of their voice calls.

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