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.
Callforeign is a global provider of customized end-to-end VoIP Solutions & Services for Internet Telephony Service Providers (ITSPs) offering wholesale & retail VoIP services to their customers.
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