olemus
IP-võrku telefonivõrguga liidestav seade
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a hardware device that converts telephony traffic into packets of data for transmission over a IP-network

ülevaateid
https://www.techopedia.com/definition/25881/voice-over-internet-protocol-gateway-voipgateway

https://en.wikipedia.org/wiki/VoIP_gateway

http://www.3cx.com/pbx/voip-gateway/

http://www.voipsupply.com/overview-of-voip-gateways