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.
Grouphone
GrouPhone is a privately held corporation, headquartered in the USA with switching facilities around the world. GrouPhone was founded by a group of technology pioneers and visionaries who transformed the Information Technology industry. GrouPhone`s founde
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