Why CallTower for Microsoft Teams
CallTower is a top-tier Microsoft Operator Connect partner globally – trusted to deliver enterprise voice, seamless deployments, and differentiated value beyond dial tone.
By the Numbers
15+ years in Microsoft voice
1.1M+ end users supported
First U.S./Canada Direct Routing provider (2017)
Global Operator Connect leader
Built for Teams from the Start
CallTower didn’t arrive late to Teams, we helped build the journey.
- Active in Microsoft voice since 2010
- OCS→Lync → Skype for Business → Teams
- Led thousands of migrations into Microsoft’s preferred model: Operator Connect
- Trusted by enterprises worldwide
Fewer Risks • Faster Migrations • Proven Execution
More Than Dial Tone
Most Operator Connect providers stop at connectivity.
CallTower delivers a complete Teams voice ecosystem:
- SMS/MMS texting
- Fax services
- Paging / door buzzers / credit card machines
- Compliance call recording
- eSim
- Analytics (queue depth reporting & insights)
- Contact centre solutions
- Third-party SIP device support (where applicable)
Higher Call Quality • Better Adoption • Long-Term Success
White-Glove Deployment
Voice success depends on implementation. CallTower removes friction:
- Auto Attendants, Call Queues, and Call Flows built in Teams Admin Center
- Phone number assignment and porting
- Admin and end-user training
- E911 documentation & compliance guidance
- Dedicated project manager
Fewer escalations • Faster go-lives • Higher customer satisfaction
Resiliency Built In
CallTower engineers’ redundancy so customers aren’t reliant on Microsoft uptime alone:
- Auto Attendant / Call Queue failover
- Voice failover
- User DID failover to mobile, alternate apps, or SIP endpoints
Business continuity • Disaster readiness • Protected revenue
