Cisco's gateway, which underwent a trial in Honolulu, functions similarly but is more hardware-based, complementing its line of network routing equipment and voice-over-IP telephony.

FORBES: Crisis Communicating

Until now, network equipment, as well as software, has suffered less than other hardware categories like servers and PCs, says Forrester Research analyst Andrew Bartels.

FORBES: Magazine Article

Replacing traditional voice service with voice over LTE will take time, as complex kinks are worked out, network equipment is installed and, eventually, phones are made with the necessary hardware.

WSJ: U.S. Wireless Carriers Move to New Technology��For Voice