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.
VASC is a child company under VNPT (Vietnam Post and Telecommunications Corp)- the biggest state-owned corporation in Vietnam. Besides doing VAS for mobile, content and data service, software, IPTV….. VASC is also offering Vietnam termination for VoIP s
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