Teams Phone Migration

A full telephony migration from Verizon One Talk to Microsoft Teams Phone, driven by the need to eliminate excessive costs, modernize communication tools, and align the phone system with how staff actually work in a post-pandemic environment. The organization was spending over $3,000 per month on Verizon One Talk and associated mobile services. Following the shift to remote and hybrid work during the pandemic, the vast majority of desk phones sat idle or unplugged — yet every device continued to incur monthly charges. The One Talk softphone saw near-zero adoption, and the overall service was drastically underutilized. The existing hardware consisted of Verizon-branded Yealink phones running locked Verizon firmware, limiting flexibility and tying the organization to a single carrier ecosystem. Meanwhile, staff were already deeply embedded in the Microsoft 365 platform, using Teams daily for chat and meetings. The phone system was the last piece that hadn't caught up with reality. The decision was made to migrate entirely off Verizon One Talk and onto Microsoft Teams Phone with a Microsoft Calling Plan. All phone numbers were ported away from Verizon to Microsoft, cutting the dependency on the carrier's telephony platform. The rollout started with a Teams client-only deployment. All staff — excluding frontline workers — were licensed for Teams Phone, giving them the ability to make and receive calls directly from the Teams desktop and mobile apps. For most users, this was the only solution needed. A solution was still needed for in-person shared workspaces such as front desks and common areas, where a physical handset is practical. Microsoft's SIP Gateway feature supports registering compatible Yealink hardware with Teams, but the existing phones were locked with proprietary Verizon firmware that prevented this. The Verizon firmware lock was bypassed by jailbreaking the Yealink phones and flashing them with the factory SIP firmware. Once restored to standard SIP operation, the phones were registered with Microsoft's SIP Gateway, upgraded to Teams firmware, and joined to the Teams environment as SIP phone devices. This eliminated the need to purchase new hardware while giving shared spaces full Teams calling capability. To further extend the platform's capabilities, 10DLC registration was completed, enabling SMS messaging for all Teams Phone users. This added a communication channel that staff had previously lacked, allowing text-based outreach and responses directly from their Teams-assigned numbers. Monthly telecom costs dropped from over $3,000 to under $700 — a reduction of more than 75% Zero new hardware purchased — existing Yealink phones were repurposed through firmware recovery Unified communications platform — voice, chat, meetings, and SMS all consolidated into Teams Improved user satisfaction — staff now use a single, familiar application for all communication Eliminated waste — no more monthly charges for idle, unplugged desk phones