Voice for GCC High Environments Now Available

GCC High organizations can now enable Audio Conferencing and PSTN calling with Microsoft Teams Direct Routing via a new partnership between C3 and CallTower. This is the first time organizations can enable a third-party hosted voice provider within GCC High, closing a known, long-term gap in Office 365 GCC High features.

As we have discussed previously, Office 365 GCC High is designed to meet the unique security and compliance requirements of the Defense Industrial Base (DIB). This includes a residency in Azure Government, full US data sovereignty, and limited integration with third parties. And while Office 365 GCC High contains most of the functionality found in the commercial versions, some features and service offerings are still being rolled out. Voice services have been a major gap in capabilities until recently.

“Voice services have always been one of the most requested features in GCC High,” reported Bill Wootton, C3’s president. “Especially now, it’s critical that the full communications capabilities of Teams are available to our clients while most of us are not able to meet in person.”

The C3-CallTower team has already begun implementing this new solution for voice with C3 GCC High clients, and we recently hosted a joint webinar to discuss how this solution works. Together, the team of experts from both C3 and CallTower has identified and overcome the many technical challenges of voice-enabled Office 365 GCC High; check out the case study and webinar here [will include links].

As we all work to adjust to the “new normal” caused by COVID-19, how and where we work will undoubtedly continue to shift. While we expect improvements to GCC High only to increase as Microsoft keeps pace with the changing environment, we’re excited to lead the way and develop created solutions to any gaps in services. Partnerships like this effort with CallTower, demonstrate our leadership in this market and allow us to augment the core Microsoft services with added value.

C3 has already helped many clients transition to a GCC High environment. Whether your company needs a secure, GCC High environment, or if you are already operating within GCC High, C3 and CallTower can help deliver voice and telephony solutions to your organization, and help your business connect and collaborate more effectively. Contact us at info@c3isit.com to learn more and get started today.


Bill Wootton is the Founder and President of C3 Integrated Solutions, a full-service IT provider based in Arlington, VA that specializes in securing our nation’s Defense Industrial Base through cloud-based solutions and industry leading partners. Bill is passionate about bringing cyber-awareness, and cyber-maturity to the nation’s Defense Industrial Base, working with clients to help them achieve CMMC and NIST 800-171 compliance by providing MSP, security and Office 365 integration services.

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