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SIP Trunking

One Connection to Global Communication

GTT’s SIP Trunking transforms how enterprises do business helping drive productivity and efficiency by integrating diverse communication capabilities onto a single global platform.

Features & Benefits

  • Flexible & Interoperable

    Our SIP Trunking offering is interoperable with all major UC platforms and can be seamlessly integrated with legacy equipment.  Thanks to GTT’s direct peering with Microsoft, we can deliver dedicated SIP trunks to a client’s Microsoft Teams service and clients will benefit from the lowest latency connectivity between GTT’s voice network and Microsoft Office 365.  GTT has further expanded its Cloud Phone peering capabilities with Cisco Webex Calling as a Cloud Connected PSTN partner and Zoom Phone BYOC, which allows clients to use GTT for voice services with the Zoom Phone cloud.

  • Comprehensive Global Footprint

    GTT offers a full suite of international services, including DIDs, toll-free, termination and emergency services, providing expansive reach on a global basis. Our global, fully redundant and robust SIP-based network has been specifically designed to meet the demands of bandwidth-intensive communication services.

  • Drives Cost Savings

    SIP Trunking is capex-efficient and easily integrated with GTT SD-WAN, MPLS or Internet services thereby eliminating the need for public switched telephone network (PSTN) gateways and ISDN BRIs or PRIs. The service also reduces local and long-distance costs as site-to-site calling is included at no charge. Managing outbound calling is simple, as calls are charged from a single, shared rate card for all sites.


  • 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 and Zoom Phone.

  • Global SIP-based voice network, which includes industry-leading Session Border Controllers for easy scalability

  • Comprehensive telephony footprint

    DIDs — Activate new or migrate existing numbers in 55+ countries.

    Toll free — 120+ countries

  • Global outbound calling – voice platform utilizes GTT’s global IP backbone to delivery low latency calls terminated locally.

  • Fast implementation of SIP Trunks

  • Free office-to-office calls

Thank you!

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Related Services

Learn more about how GTT can help support your business collaboration, mobility and growth.

Contact Us
Contact Us
Sales Inquiries:
+1 512 592 4858
General Inquiries:
+1 703 442 5500
Toll Free: +1 855 829 9900 Non Toll Free: +1 512 592 4803
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