Maunfacturer of VOIP gateways and USB handsets.
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They use Taiwanese proprietary codec Peer to Peer protocol (not even going through proxy server). All RD are located in Hsin-chu Taiwan (that’s where a lot of Taiwanese IT labs, chipset design/manufactures are located).
Product feature includes VoIp to VoIp but also a very reliable 2 way VoIP to PSTN. This 2 way VoIP to PSTN is either free in country where local phone charge is fixed monthly rate or billed by the local PSTN charge.