This is a Voice over Internet Protocol (VoIP) and streaming media service based on the Session Initiation Protocol (SIP) by which Internet telephony service providers (ITSPs) deliver telephone services and unified communications to customers equipped with SIP-based private branch exchange (IP-PBX) and Unified Communications facilities
DrVoIP represents a team of Cisco, ShoreTel and Microsoft certified engineers led by a recognized industry leader with 40 years of telecommunications experience.