Mircom TX3: changing the phone number your unit dials
A Mircom TX3 entry panel stores one record per resident: an apartment number, a dial code of up to four digits, a display name and one telephone number to dial. Changing the number is a job for whoever holds the panel passcode, normally your property manager, at the keypad or through the TX3 configuration software. Residents cannot change it themselves.
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Mircom is based in Vaughan, Ontario, and its TX3 panels are a common sight in Canadian apartment and condo lobbies. You can usually spot one by the stainless front, the large scrolling directory screen and the MIRCOM name on the plate.
This is what the TX3 stores for your unit, who can change it, and what to ask for. Everything here is from Mircom’s own TX3 programming manual, which is free to download.
What does the TX3 store for your unit?
The TX3 keeps a resident database. Each record has these fields:
| Field | What it is | Who changes it |
|---|---|---|
| Apartment number | Your unit, up to 8 digits | The building |
| Dial code | The 1 to 4 digits a visitor keys to call you. It can differ from your unit number | The building, rarely changed |
| Resident name | What a visitor scrolls to, up to 15 characters | The building |
| Telephone number | The one number the panel dials for you, up to 18 digits | The building |
| Door digits and timers | Which key opens which door, how long the door stays unlocked, how long the call lasts | The building, set for the whole panel |
There is one phone number field per record, so the panel rings one phone for your unit. Why that is true of every dial-out panel.
Does your TX3 dial a phone number at all?
Mircom’s manual describes two ways a TX3 can be set up, and they work very differently for you.
| Mode | How it reaches you | Can a number be changed? |
|---|---|---|
| ADC (auto dialer) | Calls an outside phone number over a dedicated phone line the building pays for | Yes. This is the mode this page is about |
| NSL (no subscriber line) | Rings the phone line already in your suite, through units in the building’s telephone room | No outside number is stored. It rings whatever phone is on your suite line |
If the building says the buzzer can only ring a phone plugged into your wall jack, it may be an NSL setup. How to tell a dial-out panel from a hardwired one.
Who can change the number on a TX3?
Not you. The resident database sits behind passcodes. The manual says the TX3 is configured either at the panel keypad or from a computer running the TX3 configuration software, which connects with a separate network passcode.
In practice that means your property manager, your superintendent or the security contractor the building uses. How long the change takes depends on which of them holds the passcode, so ask when you send the request.
Need to ask in writing? Get a ready-to-send message for your building manager, landlord or front desk. It is free, and nothing you type leaves your browser.
- Email your property manager with the unit and the number Ask for the telephone number on your resident record to be updated. Give the new number in full with the area code.
- Ask them to check the display name in the same message It is a separate field on the same record, and it may still show the previous tenant. One request, two fixes.
- Ask which digit opens the door The TX3 ships with
9for the main door, but the building can set it to any digit from 1 to 9,*or#. - Test it yourself from the lobby Key in your dial code, answer, check you can hear the lobby, and open the door once.
Can a TX3 ring two phones?
Not from one record. The record holds one telephone number and the panel dials it. A building could create a second record with its own dial code, but then a visitor has to know to try it.
The way around it is the same on a TX3 as on any dial-out panel: give the building one number that itself rings several phones. The panel is placing an ordinary call and cannot tell the difference. BuzzMeBro does this, ringing up to 4 phones at once for $9.99 a month per apartment. If you live alone and the panel simply has an old number, you only need the free fix above. All the options.
Which digit opens the door on a TX3?
The factory setting is 9 for the main door and 6 for the auxiliary door. The building can change either to any digit from 1 to 9, * or #. Mircom reserves 4 to refuse entry and hang up, so never press 4 for someone you want to let in.
Management can also give one unit its own door code of up to four digits, entered followed by #. The factory talk timer is 60 seconds and the door stays unlocked for 10 seconds by default. What pressing 9 actually does.
Not sure the panel is a Mircom? How to identify your building intercom walks through the faceplate, the display and the model label.
From our own door
- Switching a panel to a BuzzMeBro number means the building updates the one stored number for your unit and nothing else. Pointing it back at the old number undoes it the same day.
- BuzzMeBro only gives an apartment a number local to the building’s calling area, because many panels only dial local numbers. We check this from the postal code before any card is taken.
- BuzzMeBro has run on our founder’s own Toronto apartment door since August 2026.
Questions people ask
Can I change my own Mircom buzzer number?
No. The resident database is behind passcodes and is reached only at the panel keypad or through the TX3 configuration software. Your property manager, superintendent or the building’s security contractor makes the change.
Can a Mircom TX3 call a mobile number?
Yes, when it is set up as an auto dialer. It dials an ordinary telephone number of up to 18 digits and does not care what kind of phone answers. Whether the building’s line allows long distance is a separate question, so a local number is the safe choice.
How many phone numbers can a Mircom hold per apartment?
One per resident record. Capacities quoted for a panel count how many records it holds, not how many numbers each unit gets.
What digit opens the door on a Mircom?
The TX3 ships with 9 for the main door and 6 for an auxiliary door, and 4 refuses entry. Buildings can change the door digits, so ask yours rather than assuming.