Estech Systems (ESI) was acquired by UK-based Tollring in 2020 and the product focus pivoted to cloud — the eCloud PBX line — with the legacy ESI-50/100/200/600/1000 hybrid IP-PBXs de-emphasized. Many former ESI resellers reduced ESI focus or moved to alternative cloud platforms, and long-term support on the legacy hybrid line is uncertain.
Estech Systems — the Texas-based ESI — was acquired by UK-headquartered Tollring in 2020. The combined company refocused on the cloud-first eCloud PBX product and, increasingly, on Microsoft Teams calling integrations. The legacy ESI-50, 100, 200, 600, and 1000 hybrid IP-PBXs that dominated US small-business installs through the 2010s have been de-emphasized — still supported, but clearly not where the roadmap is heading.
The dealer channel reacted accordingly. A meaningful share of long-time ESI resellers either reduced their ESI focus or shifted their primary recommendation to another cloud platform — often after watching the cadence of new features and certifications slow on the legacy hybrid line. ESI System Programmer (the config tool for legacy hybrid systems) is still used, but fresh installs and certifications around it are getting rarer.
If you're on the eSIP Evolution Series or an ESI Communications Server, you're on a more modern, SIP-native platform — but the same channel dynamics apply. The right move for most ESI customers is to plan the exit on their schedule while everything is still operational, rather than wait for a forced migration to eCloud or a partner-handoff scramble down the road.
If you're running one of these, we have a playbook for your migration.
Step-by-step. No surprises. Your existing ESI stays operational the entire time.
Send us a screenshot of ESI System Programmer (legacy hybrid) or your eSIP Evolution / Communications Server admin console. Tell us the model, station count, trunk type, and which features (Esi-Link, Esi-Mail, ACD) you actually use.
Auto-attendant trees, departments, hunt patterns, time-of-day routing, Esi-Mail voicemail boxes, and Esi-Link multi-site routing — we rebuild it all in voip.army before the cutover.
Every DID and trunk number currently on your ESI system ports to voip.army for free. The cutover is sub-5-second — no calls lost.
Some ESI ePhone-9 series IP phones can be reflashed for voip.army — we'll evaluate yours and attempt where firmware cooperates. The ESI 24/48/60-Key Feature Phones don't survive the move; we quote Yealink or Grandstream replacements at cost. Many teams skip desk phones entirely and use our mobile/desktop apps.
Decommission the ESI-50/100/200/600/1000, eSIP Evolution, or Communications Server. Stop paying your reseller for break-fix. Recycle the equipment.
"Our accounting firm ran an ESI-200 with about 28 extensions and the Esi-Mail voicemail integrated to email. Our long-time reseller had been quietly pushing us toward eCloud for a couple of years and the pricing kept creeping up. voip.army migrated us in just over two weeks, rebuilt our department routing exactly, and got us on Yealink T54s. We're paying about $580 less a month than the renewed ESI quote and the call quality on residential WiFi is noticeably better."
The questions we get from ESI customers considering the move. If yours isn't here, ask.
Talk to migration team30-day free trial. Free migration assistance from a team that's done this hundreds of times. Your ESI stays running the entire time — no risky big-bang cutover.