If you're running an Avaya, Nortel, Mitel, NEC, Toshiba, Panasonic, Samsung, ESI, Allworx, or Comdial PBX, you're not alone — and you're not stuck. We migrate businesses off legacy phone systems every week. Free migration assistance, free porting, parallel-run during cutover so nothing breaks.
The on-premises PBX market is in structural decline. Most legacy PBX vendors have either filed bankruptcy, exited the US market, sold their on-premises business to a cloud reseller, or de-emphasized SMB development. The systems still installed in basements and back closets across America keep working — until they don't. The cost of "until they don't" is going up every year as parts become scarce and the local techs who knew the gear retire.
This page is for owners and operations leads who know they need to move and want a clear, no-pressure walkthrough of how. Pick your current vendor below for vendor-specific facts, system-by-system migration paths, and what happens to your existing phones.
Each page covers the vendor's exit/EOL trajectory, the specific systems we migrate, what happens to your existing handsets, and the 5-step migration process.
IP Office, Definity, Aura, Partner ACS. Two bankruptcies, cloud pivot.
Norstar, Meridian, BCM 50/200/400/450. Bankrupt 2009, EOL by 2018.
Strata CIX, CTX, DK. Exited US market 2017.
MiVoice, 3300 ICP, SX-200. Cloud-only pivot 2023.
SV9100, SL2100, UNIVERGE. US SMB exit 2024.
KX-NS, KX-TDA, KX-NCP. Global PBX exit 2022.
OfficeServ 7100/7200/7400. Left US PBX market 2017.
ESI-50, 200, 1000 hybrid PBXs. Acquired by Tollring 2020, cloud focus.
Connect 731/536/320. Owned by Windstream Enterprise.
Impact, DSU II, ExecuTech. Acquired by Vertical 2005.
Don't see your vendor? Tell us what you're running — we've migrated Iwatsu, Vodavi, Vertical, ShoreTel, Plantronics OmniPCX, and many more.
Step by step, vendor-agnostic. Your existing system stays live the whole time.
Tell us the vendor, model, station count, trunk type (analog/T1/PRI/SIP), and what features your team actually uses. A photo of the KSU and a screenshot of the config UI is enough to start.
Auto-attendant menus, ring groups, hunt groups, intercom patterns, time-of-day routing, voicemail trees — we rebuild it all inside voip.army before any cutover.
Every DID and trunk number ports to voip.army for free. Local numbers 1–3 business days; toll-free 5–7. Cutover is sub-5-second — no calls lost.
SIP-capable handsets get reflashed in place where the vendor allows. Proprietary digital sets and unsupported models get swapped for Yealink/Grandstream at cost — or your team simply uses the mobile and desktop apps.
After 2 weeks of stable parallel operation, decommission the legacy PBX, cancel the maintenance contract, recycle the equipment. Done.
The pattern we see, over and over.
Yes — until a card fails, a tech moves on, or your carrier sunsets the PRI. The right time to migrate is on your schedule, not the schedule a hardware failure picks.
It used to be. Cloud cutover today means a sub-5-second number port and a dial plan we rebuilt in advance. Your existing system stays operational the entire time. Real risk is much lower than perceived risk.
You're often not. Most customers reduce their monthly spend 30–60% on the new bill, AND drop the maintenance contract, AND stop paying for parts they're sourcing on the gray market.
Free migration assistance from a team that's done this hundreds of times across every major legacy vendor. Your existing system stays running. Zero downtime cutover. 30-day money-back guarantee on the new service.