No article in the knowledge graph for Deltathree yet.
Who is Deltathree?
Deltathree is a telecommunications service provider focused on Voice over IP (VoIP) and related IP communications solutions for carriers, service providers, enterprises, and consumers.
- Wholesale and retail Voice Over Internet Protocol (VoIP) telephony services for carriers, service providers, and enterprises (communications infrastructure).
- Hosted IP communications platforms for residential and small business voice services (unified communications).
- Calling card, broadband phone, and PC-to-phone offerings for consumer and SOHO segments (VoIP services).
- Back-end network infrastructure, softswitching, and interconnect services to the PSTN (voice networking).
- Management, billing, and provisioning tools that support partners delivering white-label IP telephony (service enablement).
Show more
More About Deltathree
Deltathree operates as a provider of Voice over IP (VoIP) and IP-based telephony services that support carriers, service providers, enterprises, and end users. Its portfolio centers on enabling voice communications over broadband and IP networks, with connectivity to the public switched telephone network (PSTN) where required. The company positions its offerings both as direct services to consumers and small businesses and as wholesale or white-label capabilities for partners that want to deliver VoIP under their own brands.
The company’s wholesale and carrier-focused services System Integration Testing (SIT) in the communications infrastructure and voice networking categories. These services typically include IP trunking, termination and origination, and interconnectivity between IP networks and traditional PSTN endpoints. Architecturally, Deltathree’s environment relies on VoIP building blocks such as softswitches, session control elements, media gateways, signaling protocols like Session Initiation Protocol (SIP) (Session Initiation Protocol), and codecs for compressing and transporting audio over IP networks. This arrangement allows partners and enterprise customers to integrate telephony into their existing data networks while maintaining access to global voice routing.
For retail and small business users, Deltathree offers services that fall under unified communications and consumer VoIP categories. These include broadband phone and PC-to-phone calling, often combined with local or virtual phone numbers, voicemail, and standard telephony features. Such services usually require Customer Premises Equipment (CPE) (for example, an analog telephone adapter or IP phone) or a softphone client, and they connect to Deltathree’s back-end infrastructure over broadband internet links. From an enterprise or SOHO perspective, these offerings provide IP-based alternatives to traditional fixed-line telephony, with routing and billing handled through Deltathree’s platforms.
Partners that use Deltathree for white-label services gain access to service enablement capabilities that include provisioning, billing integration, and customer management tools. These SIT in the OSS/BSS (operations support systems / business support systems) category. Deltathree exposes management interfaces and administrative portals that allow service providers to define rate plans, manage end-user accounts, configure routing profiles, and monitor usage. This structure supports integration into broader service portfolios where partners combine VoIP with broadband, mobile, or bundled offerings.
From a marketplace taxonomy perspective, Deltathree is categorized under VoIP service providers, wholesale voice carriers, and hosted IP telephony / unified communications platforms. Its technology stack is aligned with common IP communications standards such as SIP for signaling and Real-time Transport Protocol (RTP) (Real-time Transport Protocol) for media transport. Enterprise technical stakeholders typically evaluate Deltathree in the context of interoperability with existing PBXs or IP-PBXs, network Quality of Service (QoS), geographic coverage for numbering and termination, and alignment with their broader voice and collaboration strategy.
Our description of Deltathree. Updated December 2025.
