This is a device allowing a user to make VoIP calls using session initiation protocol (SIP). SIP is a telecommunication technology developed as a fast, easy standard for delivering IP-based data, voice, and video communications.
"Telecomtrade" trade system is dynamic developed company which offer complex of telecommunication services both for private individual and corporate clients.Constantly increasing demand influence on extension of voip market and as a result new sides of bu
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