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Sipgate was founded in 2004 and became one of Germany's largest VoIP service providers for consumers and small businesses. Through its network, which used SIP protocol, it allowed making low-cost national and international calls and provided customers with an incoming geographical phone number.
International calling service using VoIP and IVR Nfon: Munich: Germany: Cloud-based telephone systems Nextiva: Scottsdale, Arizona: United States: Cloud-based Communications, VoIP and IVR Ooma: Palo Alto, California: United States: VoIP communications for small businesses, home and mobile Radvision: New Jersey: United States
Google provides free PC-to-PC voice calling worldwide. As described above, Google Voice users in many countries may make low-cost calls to international phone numbers, and currently may also make free PC-to-phone calls within the United States and Canada. Vincent Paquet, a co-founder of GrandCentral who became a senior product manager at Google ...
SIPSERVICE was a Voice over IP (VoIP) service provider based in Switzerland that also operated in Germany and Russia.. The service offered free calls between SIPSERVICE users. In addition it offered fee-based calling packages for calls to domestic and international destination
Rebtel provides low-cost or free [5] international call services. Its service was first available as an intermediary service accessible by dialing a particular phone number but is now available through iOS and Android apps with a combined download count totaling over 10M users.
The VoIP E911 emergency-calling system associates a physical address with the calling party's telephone number. All VoIP providers that provide access to the public switched telephone network are required to implement E911, a service for which the subscriber may be charged. "VoIP providers may not allow customers to opt-out of 911 service."