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Voice peering is the process of forwarding calls from one Internet service telephony provider (ISTP) to another using purely Voice over Internet Protocol (VoIP) technology. Unlike regular VoIP calls, voice peering is not forwarded over the public switched telephone network (PSTN), so there are no call charges. This means costs savings as well as better call quality because there is no required transcoding between the VoIP cloud, the PSTN and back again.
Voicing peering is also known as Voice over Internet Protocol peering (VoIP peering).