Deltathree | 659 followers on LinkedIn. Founded in 1996, deltathree (OTCBB: DDDC) is a well-known provider of integrated Voice over Internet Protocol (VoIP) telephony services, VoIP products, hosted VoIP solutions, and infrastructure. deltathree offers high quality Internet telephony solutions that are viable and cost-effective alternatives to traditional telephone services. Supporting tens of thousands of active users around the world, deltathree serves customers through its two primary distribution channels: the Service Provider / Reseller channel and the direct-to-consumer channel. deltathree advanced VoIP solutions offer service providers and resellers a full spectrum of private label VoIP products and services (including PC to Phone and Broadband VoIP Phone) as well as a back-office suite of services.