Voice over IP

VoIP server, 


VoIP clients,  computing devices.  include: hard phones(looks like a normal phone actually a phone buit-in software), soft phones(usually installed on normal laptop,ipad, etc..)
 accounts & passwd, extension..


Voice gateway,  allows you use the VoIP phone communicate with the normal phone.


protocol  such as SIP(free open source protocol)


codec


latency  45ms,   75ms--100ms,   not exceed 100ms.


QoS,
 


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