From BusinessWire.com Vonage selects TCS for VoIP E9-1-1 service
July 18, 2005--Vonage, the leading provider of broadband phone service, has selected TeleCommunication Systems a leading provider of precise location and wireless data technology, to provide critical Enhanced 9-1-1 (E9-1-1) technology components for Vonage's Voice-over-Internet Protocol (VoIP) customers
Under the new agreement, TCS will deliver ALI (Automatic Location Identification) steering, call routing, call center and other services enabling Vonage to meet the new E9-1-1 requirements for interconnected VoIP Service Providers
Or maybe they chose them because of this
See how it's all coming together?