VoIP service provider Vonage said Thursday that more than one million of its subscribers are equipped with Enhanced 911 (E911) emergency calling service, which automatically links a physical address with a caller's telephone number.

Vonage and other VoIP providers were instructed by the Federal Communications Commission last year to provide effective E911 service in the wake of incidents in which callers in need of emergency help were unable to establish their locations.

Vonage said it worked with 911 Public Safety Answering Points throughout the U.S. to turn on the emergency calling service. The VoIP calling firm noted that it has a national emergency call center for its customers who use Wi-Fi phones or other calling devices not directly connected to landline phones.

"With one million subscriber lines turned up with E911 service in just nine months, Vonage is leading the fastest nomadic E911 deployment in telecommunications history," said Jeffrey Cinron, Vonage's chairman and chief strategist, in a statement.