Data Sheet

Cloud Phone Direct

GTT Cloud Phone Direct is GTT’s SIP trunking offering that supports direct routing to Microsoft Teams, Cisco Webex Calling, and Zoom Phone for your voice needs.

Global, scalable & high-performing Enterprise voice services

COMBINE YOUR CLOUD-BASED PHONE SYSTEM WITH GTT SIP TRUNKING TO TRANSFORM YOUR BUSINESS

Integrating diverse communication capabilities onto a single global platform is key for the modern enterprise. GTT Voice supports PSTN calling, global termination, and emergency services all delivered via pre-established
secure connections to the major cloud-based phone providers.

Pre-established secure connections to key cloud phone providers

Cloud phone systems are rapidly growing in the enterprise market and have changed the way we work and communicate. GTT Cloud Phone Direct is GTT’s SIP trunking offering that supports direct routing to Microsoft
Teams, Cisco Webex Calling and Zoom Phone for your voice needs.

GTT CLOUD PHONE DIRECT

Microsoft Teams

GTT delivers dedicated SIP trunks to Microsoft Teams. As a Tier 1 ISP, GTT peers directly with Microsoft, ensuring the lowest latency connectivity between our dedicated voice network and Microsoft Office 365.

Cisco Webex Calling

The GTT SIP Trunking service can provide Cloud Connected PSTN (CCP) capabilities for Cisco Webex Calling clients. Customers can make inbound and outbound telephone calls using telephone numbers assigned by or ported
to GTT.

Zoom Phone

With Zoom’s Bring Your Own Carrier (BYOC) feature, customers can use GTT SIP Trunking together with the Zoom Phone cloud. Customers can enjoy all of the features of Zoom Phone while benefiting from GTT’s global voice solution for outbound calling, as well as new and ported Direct Inward Dialing numbers (DID)s.

Industry Insights

Our Gartner Rating

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Global WAN Services

4

 
 

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As of 14 August, 2025
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We’re proud to share that GTT has been ranked as a Leader in the 2025 ISG Provider Lens™ Software-Defined Solutions & Services reports. This recognition reflects our continued commitment to delivering secure networking as a service for global enterprises.