GCC-High customers can make off-net calls from Microsoft Teams using AT&T

Phone System and Audio Conferencing for GCC-High and Department of Defense (DoD) environments delivered with by AT&T Cloud Voice for Microsoft Teams – Enhanced

AT&T provides Microsoft Teams Direct Routing via global UC Nodes utilizing direct peering between AT&T managed high-availability session border controllers (SBCs) and the customer Enterprise and GCC-High Teams tenant.

The Challenge:

Microsoft 365 provides different environments for government agencies to meet varying compliance requirements.
Microsoft 365 Government Community Cloud High is designed for federal agencies, defense industry, aerospace industry, and other organizations that hold controlled unclassified information.
Phone System and Audio Conferencing for GCC-High and DoD environments can only be delivered via Direct Routing.

Features and Benefits:

Integration expertise from AT&T for pre-sales, design, consulting, and support is available to get you up and running quickly.
High-availability pair session border controllers
Pre-established direct peering with Microsoft data centers
Customer dedicated SBCs listed in the Government Approved List (APL)
Segmentation of SBC and dedicated network access available to support NIST and FedRAMP requirements
Local Gateway/SBC support when required by local regulatory requirements
Secure RTP and TLS for media and signaling
Global 7X24 monitoring and management - support provided in the USA in a secure NOC

AT&T - Direct Routing for Teams for GCC-High

by AT&T