Moving from Avaya to Microsoft Teams Is Not Just Moving Phones
A voice migration always sounds simple when it is summarized in one sentence.
“We are moving from Avaya to Microsoft Teams.”
That sentence is technically correct. It is also doing a lot of work.
A large phone environment is not just a collection of people with extensions. It includes main numbers, auto attendants, call queues, hunt groups, voicemail boxes, emergency calling, contact centers, analog devices, conference rooms, security desks, call recording, reporting, carrier services, and years of business decisions that were quietly turned into routing rules.
Some of those decisions are still valid.
Some exist because a manager requested them in 2013 and nobody remembers why.
A migration forces the organization to look at all of it.
The technical part matters, of course. Numbers have to route correctly. Users need policies and licenses. SBCs need capacity. Certificates need to be valid. Emergency locations need to be accurate. The old and new systems may need to coexist for months.
But the harder part is often discovering what the business actually does.
A department might say it has one main number. Then you find out that number forwards to a queue, overflows to another team, sends after-hours calls to an answering service, and has a special holiday message recorded by someone who left the company four years ago.
That is not one number. That is a small application.
The best migration work starts with inventory and questions.
Who owns this number?
What happens during business hours?
What happens after hours?
What happens when nobody answers?
Does the call need to be recorded?
Can the caller reach a person, or does the process depend on a shared voicemail box?
What happens during an outage?
The answers become the design.
This is also why a direct one-for-one rebuild is not always the right goal. Older systems often contain years of workarounds. Recreating every workaround in a new platform can move technical debt without solving it.
Sometimes the correct answer is to simplify.
Other times the strange old process exists for a very good reason, and removing it would break something important.
The job is knowing the difference.
A successful migration is not the day the final phone number moves. It is the point where users can do their jobs, support teams understand the new environment, monitoring is in place, documentation is usable, and the old system can be removed without everyone suddenly remembering one forgotten fax line.
That last fax line is always out there.
Moving from Avaya to Teams is not just replacing a phone system. It is translating years of business behavior into a new platform while keeping the company available during the process.