GTT Communications

Specializes in tailored mid-market managed IT and networking solutions, combining carrier-diverse branch WAN aggregation with enterprise SD-WAN management (VeloCloud and Cisco Meraki) and turnkey hosted voice/UCaaS integration.

Directly targets mid-market multi-location businesses needing single-source outsourcing for last-mile circuit management, managed SD-WAN, and hosted PBX/Microsoft Teams voice calling.

Built around fully managed, multi-carrier WAN aggregation, co-managed or fully managed SD-WAN, and cloud-hosted business phone systems tailored for mid-market distributed enterprises.

Focuses heavily on mid-sized distributed organizations seeking to outsource nationwide branch connectivity, managed firewall/SD-WAN, and hosted Unified Communications (UCx) under one SLA.

An established nationwide aggregator providing single-invoice, multi-carrier branch WAN transport paired with fully managed SD-WAN appliances and hosted enterprise voice/cloud PBX.

Combines extensive underlying network infrastructure and third-party access aggregation with VMware-powered managed SD-WAN and OfficeSuite UC hosted voice designed for multi-branch organizations.

Leading multi-site branch aggregator consolidating diverse local telecom/broadband circuits with managed SD-WAN edge hardware and Granite hosted cloud PBX on a single consolidated invoice.

Operates Comcast Business, which bundles multi-site broadband/Ethernet WAN, managed SD-WAN (ActiveCore platform), and Business VoiceEdge cloud PBX tailored for mid-market footprints.

Delivers managed SD-WAN overlays integrated across hybrid branch connectivity options and cloud voice services, suitable for mid-market businesses requiring broad national network reach.

Specializes in multi-carrier connectivity aggregation across hundreds of local access providers paired with enterprise-grade managed SD-WAN and automated cross-carrier ticketing.

Dominant US multi-site aggregator that consolidates broadband, fiber, and wireless circuits onto a single invoice while delivering managed overlay SD-WAN and 24/7 network monitoring.

Offers large-scale multi-carrier transport aggregation including wireline, LTE/5G wireless, and satellite, orchestrated under fully managed hybrid SD-WAN networks tailored for distributed retail and multi-site branches.

Tailored for mid-market and enterprise businesses needing unified multi-carrier WAN sourcing and fully managed multi-vendor SD-WAN/SASE overlays with centralized proactive monitoring.

Focuses directly on multi-carrier circuit aggregation across broadband, fiber, and wireless providers combined with turnkey managed SD-WAN design, deployment, and AI-enabled observability.

Specializes in global and domestic multi-carrier internet underlay aggregation, intelligent internet path optimization, and multi-vendor managed SD-WAN overlays for distributed branches.

Delivers enterprise-grade multi-location network integration, pairing multi-source connectivity procurement and staging with turnkey managed SD-WAN and Network-as-a-Service capabilities.

Combines extensive Tier 1 network transport with third-party carrier aggregation and comprehensive managed SD-WAN overlays powered by major edge virtualization platforms.

Blends national cable and fiber broadband access with nationwide third-party circuit aggregation and the ActiveCore SDN platform to deliver fully managed enterprise SD-WAN overlays.

Offers enterprise-grade managed UCaaS, native Microsoft Teams Voice integration with proprietary Universal SIP core infrastructure, and full-stack managed branch SD-WAN and networking.

Provides certified Microsoft Teams Operator Connect calling plans integrated with managed enterprise SD-WAN, SASE, and cross-carrier branch network connectivity under unified management.

Delivers managed UCaaS and cloud voice integrated directly into Microsoft Teams alongside managed VMware/Fortinet SD-WAN branch connectivity, controlled via a unified WE Connect portal.

Specializes in Microsoft Teams Operator Connect and Direct Routing telephony coupled with fully managed SD-WAN and multi-carrier branch broadband aggregation.

Supplies mid-market and enterprise businesses with UCaaS Sessions and Microsoft Teams voice enablement paired with nationwide managed broadband, active-active Ethernet, and SD-WAN.

Delivers Cloud Voice for Microsoft Teams via Operator Connect coupled with nationwide managed SD-WAN and branch Internet access services through Cox Business.

Offers enterprise-scale managed direct routing and voice services for Microsoft Teams delivered over Lumen's national fiber infrastructure and managed SD-WAN network fabric.

Provides comprehensive managed UCaaS and Operator Connect voice for Microsoft Teams, integrated directly with AT&T Managed SD-WAN and Dedicated Internet branch connectivity.

Offers Verizon VoIP for Microsoft Teams (Operator Connect and Direct Routing) packaged with managed branch SD-WAN and enterprise SASE services under a unified SLA.

Offers fully managed, cloud-first SD-WAN delivered via a global private L2 core backbone, providing built-in application acceleration, multi-ISP dynamic path steering, and automated link failover.

Specializes in multi-underlay ISP aggregation combined with managed SD-WAN and AI-driven path optimization (Enhanced Internet) for enterprise cloud traffic steering and automatic failover.

Through Comcast Business and Masergy capabilities, provides fully managed SD-WAN across multiple broadband and DIA circuits, featuring dynamic traffic routing and direct multi-cloud on-ramps.

Provides managed SD-WAN overlay solutions paired with carrier-neutral multi-ISP transport management, automated path failover, and high-performance cloud connectivity.

Delivers end-to-end managed SD-WAN services with multi-ISP integration, intelligent application-aware path selection, and integrated cloud gateway connectivity across North America.

Offers enterprise-grade managed SD-WAN services incorporating dual-ISP active-active load balancing, sub-second failover, and managed interconnects to major cloud providers.

Delivers cloud-first managed SD-WAN solutions tailored for midmarket and enterprise branch environments, managing multi-carrier underlays with dynamic failover and traffic shaping.

Specializes in multi-carrier WAN sourcing and fully managed SD-WAN as-a-service, providing proactive SLA monitoring, dual-ISP automatic failover, and cloud application prioritization.

Through Windstream Enterprise, provides managed VMware/Fortinet-powered SD-WAN that optimizes multi-ISP broadband and DIA circuits with dynamic QoS and real-time failover.

Offers an extensive Tier 1 global IP backbone, multi-carrier access aggregation, managed SD-WAN (supporting VMware/VeloCloud, Cisco, Versa), and native enterprise voice with Microsoft Teams Operator Connect and Cisco Webex PSTN integration.

Specializes in global managed connectivity, multi-provider network integration, managed SD-WAN/SASE, and multinational cloud voice integration including Operator Connect for Microsoft Teams and Zoom Phone Provider Exchange.

A leading global network aggregator delivering managed multi-carrier SD-WAN and unified communications services under single-vendor contracts, featuring BT Cloud Work and global Microsoft Teams direct routing/Operator Connect.

Provides enterprise-grade managed network services across multinational footprints, including multi-vendor SD-WAN design/monitoring and comprehensive global cloud voice aggregation across Microsoft Teams and Cisco ecosystems.

Leverages a wholly owned global subsea cable and Tier 1 IP network to deliver IZO Managed SD-WAN combined with Global Voice Services and Operator Connect integration for leading UCaaS platforms under SLA-backed management.

Serves as a premier multi-carrier aggregator in North America, consolidating disparate local telecom and broadband carriers onto a single bill while providing managed SD-WAN (Granite Guardian) and Cloud Connect/Direct Routing for Webex and Teams.

A pioneer in software-defined networking, offering fully managed SD-WAN and SASE with integrated multi-carrier transport, paired with native unified communications and direct SIP integrations for Cisco Webex Calling and Microsoft Teams.

Delivers an all-in-one managed SD-WAN and Unified SASE platform utilizing a global private L2 backbone, complete with last-mile multi-carrier procurement/management and optimized cloud on-ramps for real-time UCaaS/voice performance.

Specializes in multi-carrier global internet and underlay procurement, managed SD-WAN overlay orchestration across all tier-one appliance vendors, and enterprise cloud on-ramps optimizing PSTN SIP and UCaaS traffic globally.

Operates an enterprise-grade global IP voice network covering over 60 countries with direct-to-carrier connectivity, native BYOC support for major CCaaS/UCaaS platforms (Genesys, Microsoft Teams, Zoom Phone, Cisco Webex), and built-in global emergency calling compliance.

Provides Elastic SIP Trunking with global PSTN termination and origination, offering instantaneous self-service provisioning of international DIDs/toll-free numbers across 100+ countries, failover disaster recovery routing, and native support for major enterprise PBX and contact center systems.

Delivers global carrier-grade SIP trunking over a private fiber backbone, acting as a licensed carrier in dozens of international markets with automated DID provisioning, granular routing controls, and full BYOC integration for enterprise unified communications.

Offers tier-1 international voice reach through its Global SIP Connect service, delivering extensive two-way PSTN replacement, full regulatory compliance, and multi-cloud collaboration interconnections across North America, Europe, and Asia-Pacific.

Provides scalable Elastic SIP Trunking powered by owned tier-1 carrier infrastructure, delivering direct PSTN interconnects, global virtual phone numbers, and enterprise integrations with platforms like Genesys Cloud CX and Microsoft Teams.

Delivers global cloud SIP trunking and international number coverage across 120+ countries, offering specialized BYOC and SIP link integrations for major contact centers and UCaaS providers with integrated regulatory compliance.

Provides enterprise-grade SIP trunking (VoIP Access) with deep pan-European and Asian metropolitan network footprint, offering fully compliant PSTN replacement, DDI allocations, and certified direct routing for cloud collaboration suites.

Provides Vodafone Business Global SIP, consolidating international corporate voice across dozens of countries with carrier-grade SLAs, centralized routing, and certified enterprise UC/CCaaS interoperability.

Delivers BT Global SIP, enabling multinational organizations to centralize PSTN access, port existing numbers, and connect legacy PBXs or cloud platforms (such as Cisco Webex, Microsoft Teams, and Zoom) across international territories.

Operates AS1299, consistently ranked among the world's top Tier-1 IP backbones with extensive reach across North America and Europe, delivering wholesale IP transit up to 400 Gbps and underlying optical wavelength transport.

Operates AS3356 (formerly Level 3), one of the most interconnected Tier-1 backbones in the world, offering high-speed IP transit with native 100G/400G ports and long-haul optical transport across North America, Europe, and Asia-Pacific.

Provides the Tier-1 Global IP Network (AS2914) under NTT DATA, distinguished by its transpacific backbone capacity, tight routing controls, and peering density connecting North America, Europe, and Asia.

Operates AS174, delivering cost-efficient, high-volume Tier-1 wholesale IP transit and optical wave transport through thousands of carrier-neutral data centers across North America, Europe, and Asia.

Operates Tier-1 backbone AS6453, handling a significant share of global internet routes and subsea cable connectivity spanning major Asian hubs, Europe, and the Americas.

Combines a dense dark fiber and 400G optical transport network across North America and Western Europe with wholesale IP transit on Tier-1 backbone AS6461.

Operates the Seabone Tier-1 IP backbone (AS6762), providing high-capacity wholesale transit and optical subsea transport bridging Europe, the Mediterranean basin, the Americas, and Asia.

Wholesale infrastructure subsidiary of Telefónica operating Tier-1 backbone AS12956, underpinned by an extensive transoceanic subsea fiber mesh linking the Americas and Europe.

Operates AS6939, maintaining the world's most connected IPv6 backbone and one of the largest IPv4 peering meshes across exchange points globally, making it a standard choice for multihomed transit blends.

Offers an all-in-one managed SD-WAN and Unified SASE-as-a-service model, combining multi-carrier last-mile sourcing with a private core backbone and embedded cloud/edge security under a single managed SLA.

Specializes in multi-carrier aggregation across 100+ wireline and wireless carriers, delivering fully managed SD-WAN, automated circuit remediation, and integrated firewall/SASE security on one bill.

Extensively manages large-scale distributed branch environments in the US, aggregating broadband, wireless 4G/5G, and satellite connectivity with turnkey SD-WAN operations and perimeter cybersecurity.

Provides end-to-end managed global and domestic Internet underlays spanning thousands of local ISPs, layered with multi-vendor SD-WAN management and cloud-delivered SASE edge security.

Delivers full-lifecycle outsourced branch networking, sourcing diverse carrier circuits while managing multi-vendor SD-WAN appliances and advanced edge security (NGFW/SASE) under a single NOC support structure.

Provides carrier-agnostic underlay aggregation alongside AT&T connectivity, integrating multiple SD-WAN technology platforms with unified threat management and 24/7 managed NOC operations.

Offers enterprise-grade managed multi-carrier underlay procurement, SD-WAN lifecycle administration, and advanced edge security integration tailored for highly distributed multi-site organizations.

Delivers managed SD-WAN overlaid across hybrid multi-carrier access links, integrating centralized orchestration and cloud-delivered SASE security architecture.

Comcast Business provides mid-market and enterprise managed branch services, combining diverse multi-carrier broadband and LTE circuits with managed SD-WAN and Unified Threat Management edge security.