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.
Talk to a Voice Expert
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
SIP-based interoperability with UC platforms (Microsoft, Avaya, Cisco, ShoreTel & Siemens). Flexible access options, include public IP & private network.
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
SIP Trunking
Integrating diverse communication capabilities onto a single global platform.
Industry Insights
Top Cybersecurity Trends of 2025: What You Need to Know
What is Network and Security as a Service (NSaaS) and How Does it Benefit Your Enterprise?
Why Managed Services Make Sense for a SASE Framework
The Big Takeaway: 97% Say Cybersecurity & Network Integration is the Logical Next Step
5 Common Ways Cybercriminals Spread Malware (and How To Outsmart Them)
How is ESG part of working at GTT?
Unlocking My Full Potential: The Power of Training, Mentoring and Learning at GTT
DDoS Attacks in the First Half of 2024
How to Choose The Right SD-WAN Managed Service Provider for Your Business
OUR GARTNER RATING
4.2
88%
