We move large enterprises from legacy PBX and Microsoft Calling Plans to Teams Direct Routing — engineered, verified, and compliant. Save up to 60% on annual voice costs.
Avaya Aura 10.1 reaches end of support in January 2026. Mitel filed Chapter 11 and MiVoice Connect has reached end of sale. If your enterprise is running legacy voice infrastructure, you're on a countdown — to unsupported hardware, to compliance gaps, to a migration you'll have to do under pressure.
We've mapped the migration path to Teams Direct Routing. And we've done it for the hardest cases — the analog lines, the elevator phones, the warehouse paging systems that cloud-only solutions can't touch.
Get your migration assessment →Migrate from Avaya, Cisco, or Mitel to Teams Direct Routing with full analog integration and E911 compliance. Phased delivery — discovery, design, pilot, production cutover, hypercare.
Already on Teams? If you're using Microsoft Calling Plans at scale, you're overpaying. We migrate you to Direct Routing and cut annual voice costs by up to 60%. Verified, not estimated.
E911 compliance audits (Kari's Law, RAY BAUM's Act). SBC trust-store security audits. Analog device integration — fax, paging, elevator phones — through your SBC into Teams.
We don't do "estimates." We build audited financial models that show exactly what you'll save, before you sign. A 5,000-user enterprise on Microsoft Calling Plans pays $480K–$900K annually. After migration to Direct Routing, trunking costs drop to ~$45K.
Global system integrators configure. Carriers connect. We engineer — at the SIP packet level, across AudioCodes and Ribbon SBCs, with analog integration that cloud-only solutions like Operator Connect cannot support.
SIP packet-level debugging, protocol translation (H.323/SCCP → SIP, RTP → SRTP), dial-plan archaeology
Elevator phones, warehouse paging, fax machines stay live through your SBC into Teams
Kari's Law, RAY BAUM's Act, dynamic E911 with PIDF-LO location routing, engineered into your architecture
Five stages. Fixed fee. Every phase has deliverables you sign off before we move to the next.
Full audit of voice infrastructure, dial plans, analog lines, compliance status
Low-level design, lab validation, SBC configuration
Production pilot with subset of users, analog testing, E911 validation
Full cutover: PBX decommission, number porting, all users migrated
Post-cutover monitoring, issue resolution, stabilization
Total: $100,000 — Fixed-fee SOW. No surprises.
Cutover Partners was founded by telecom engineers who've spent careers inside SIP traces, dial plans, and cutover war rooms. We're not generalist IT consultants who added "Teams" to their service list. We're the specialists you want in the room at 2 AM during cutover.
Whether you're facing a vendor deadline, bleeding cost on Calling Plans, or need to get E911 compliant — we've mapped the path. Start with a migration assessment.
Get your migration assessment →Or explore our Trojan Horse audits —E911 compliance audit ·SBC trust-store security audit