VOICE
Your Tier 1 Telephony Partner
Whether you’re migrating to cloud-based telephony or connecting your voice infrastructure over SIP, we have you covered. Our Voice services help you take advantage of the advanced functionality and cost efficiencies these solutions bring – all backed by the global reach of the GTT Tier 1, IP backbone that supports our SIP-based voice network.
The Benefits of
GTT Managed Networking
EXPANSIVE & SCALABLE NETWORK
Whether you’re migrating to cloud-based telephony or connecting your voice infrastructure over SIP, we have you covered. Our Voice services help you take advantage of the advanced functionality and cost efficiencies these solutions bring – all backed by the global reach of the GTT Tier 1, IP backbone that supports our SIP-based voice network.
GLOBAL
TELEPHONY FOOTPRINT
We offer one of the largest global footprints for DIDs, termination & toll-free services. We also provide emergency services in many countries.
DIVERSE TECHNOLOGIES & PLATFORMS
WHY GTT VOICE?
Diverse global communications services integrated onto one connection.
Interoperable with key UC platforms and legacy infrastructure. Supports direct routing to Microsoft Teams, Cisco Webex Calling & Zoom Phone.
Global SIP-based voice network, which includes industry-leading Session Border Controllers for easy scalability.
Comprehensive telephony footprint with DIDs in 55+ countries and toll free in 120+ countries.
Low latency global outbound calling using our IP backbone to deliver locally terminated calls.
Free office-to-office calls.
Our Voice Portfolio
Whether you’re migrating to cloud-based telephony or connecting your voice infrastructure over SIP, we have you covered. Our Voice services help you take advantage of the advanced functionality and cost efficiencies these solutions bring – all backed by the global reach of the GTT Tier 1, IP backbone that supports our SIP-based voice network.
SIP Trunking
Integrating diverse communication capabilities onto a single global platform.
Virtual Voice Network
Industry Insights
Explore our collection of videos, research, guides and more with invaluable insights into our digitally networked world.
Why Peak-Season Success Starts With Always-On Connectivity
GTT Receives Leader Status in Frost & Sullivan’s 2025 Managed SD-WAN Radar™
The Operational Advantages of SD-WAN and SASE from GTT
GTT Wins Intelisys’ Most Improved Channel Program: A Deep Dive into Partner-Obsessed Momentum
ISG ranks GTT as a leader in SD-WAN and SASE in the U.S. and the U.K. and in SD-WAN in Germany
Why Private Cloud Is Surging and What It Means for Your Network
Navigating the Surge: Effective Strategies for DDoS Mitigation in 2025 and Beyond
E-commerce Security: How to Protect Your Business from Cyber Threats
Mitigating Risk with Secure Network Services
Global WAN Services
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