It allows the user to choose between a data network or wi-fi hotspots to transmit calls.

The company developed many of its own systems to transmit calls using Internet technology, which can be more efficient and cheaper than traditional telephone lines.

It would be allowed to transmit calls from the Chicago area to any location in the country, and to offer toll-free (800) services with nationwide reach.

But after falling to the basement, the injured firefighters used their radios to transmit calls for help, fire officials said.

The system would be capable or transmitting calls without necessarily routing them through a traditional telephone company.

First, a problem developed in transmitting calls into and out of the city.

This phone wasn't licensed to transmit calls via AT&T, you dope.

But their timetables could slip if the digital technology to transmit calls was to hit snags.

Today's analog systems transmit calls on electromagnetic radio waves that in essence mimic the wave pattern of the voice.

Even so, transmitting calls with Internet technology is more efficient than traditional telephone networks, which means lower costs.