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2. iNum Initiative - Wikipedia

   en.wikipedia.org/wiki/INum_Initiative

   Voxbone offered free SIP termination to all service providers who offered it to their customers at or below the cost of a local call, leading many providers to offer the service at no cost. For example, Callcentric and ippi offered free iNum numbers and calls to any customer, [5] [6] and VoIP.ms offered them at no additional cost to existing ...

3. Google Voice - Wikipedia

   en.wikipedia.org/wiki/Google_Voice

   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 ...

4. Linphone - Wikipedia

   en.wikipedia.org/wiki/Linphone

   Linphone (contraction of Linux phone) is a free voice over IP softphone, SIP client and service. It may be used for audio and video direct calls and calls through any VoIP softswitch or IP-PBX. Linphone also provides the possibility to exchange instant messages.

5. Toll-free telephone numbers in the North American Numbering ...

   en.wikipedia.org/wiki/Toll-free_telephone...

   Calls that cross U.S. LATA boundaries, or originate in one country and terminate in another, are referred to as inter-exchange calls. The format of the toll-free number is called a non-geographic number, in contrast to telephone numbers associated with households that are geographic. (Since the advent of cell phones and voice over IP ...

6. Ooma - Wikipedia

   en.wikipedia.org/wiki/Ooma

   Ooma Telo was released on October 1, 2009. Telo is designed to provide unlimited, free VoIP calls within the United States. It features Bluetooth integration, HD voice, and a cordless DECT 6.0 handset. [33] Existing landline, VoIP, or mobile numbers can be ported to Ooma. [34]

7. sipservice - Wikipedia

   en.wikipedia.org/wiki/Sipservice

   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