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Fanvil VoIP IP Phones Fanvil VoIP IP Phones products are compatible with all IP-PBXs that support the SIP protocol. Fanvil also verifies that our VoIP products interoperate with particular IP-PBXs without pursuing official certification. Fanvil performs rigorous in-house testing of our products with IP-PBXs, and through such testing we are able to verify interoperability. Fanvil […]