You pressed 9 and the door did not open
A door digit that does nothing may mean your building does not use 9. The digit that releases the door is set in the lobby panel, and Mircom’s TX3, for example, accepts any digit from 1 to 9, star or pound. The other causes are pressing it too early, a call path that distorts the tone, and a door release or wiring fault the building has to fix.
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The buzzer rang, you answered, you pressed 9, and your friend is still outside. This is the last step in the chain and the one most likely to fail silently.
One: it is probably not 9
Nine is a common default, not a standard. The digit that releases the door is configured in your building panel. Mircom’s TX3 manual has installers pick any digit from 1 to 9, star or pound, and DoorKing panels have their own programmable tone open numbers.
Email property management and ask which digit releases the lobby door for your building. It is one line and it settles most of these. What else to ask in the same email.
Two: timing
Answer first, hear the visitor and confirm who it is, then press. A digit pressed while the call is still connecting goes nowhere, because the panel is not listening for it yet.
Hold it for a beat rather than tapping. Panels listen for the tone with a sensitivity setting (Mircom’s runs from 1 to 8), so a clipped or faint tone can be missed.
Three: the call path is eating the tone
The digit travels down the call as an audible tone, and every hop the call takes is a chance for that tone to be degraded or dropped. The internet standard for carrying keypad tones over internet calls says why: low-rate voice codecs may not reproduce these tones accurately enough for a machine to recognise them, so they are meant to be sent as separate digit signals.
| How the buzz reaches you | What can go wrong with the tone |
|---|---|
| Panel dials your mobile directly | Fewest hops. Wi-Fi calling on your phone adds an internet leg. |
| Carrier call forwarding | One extra leg, usually still on the phone network |
| A VoIP or app number, such as Google Voice | The call becomes internet audio. If the tone is squeezed through a voice codec rather than sent as a digit signal, the panel may not hear it. |
Whether a given route passes the tone cleanly depends on the services involved, and the only real test is your own door. Google Voice and apartment buzzers covers that route in detail.
Four: the release itself is broken
If you have the right digit, the timing is right and the call is direct, and the door still does not open for anybody in the building, the fault is likely in the hardware. Mircom’s troubleshooting for this exact symptom lists the door strike power supply and damaged or loose wiring, after checking the digit.
That is a building repair. Report it as a door not releasing rather than as a buzzer problem, because those go to different people. Working through the rest of the chain.
BuzzMeBro stores the digit your own building uses instead of assuming 9, and rings up to 4 phones on every buzz so someone who knows the visitor can answer and open. Start free.
From our own door
- BuzzMeBro has run on our founder’s own Toronto apartment door since August 2026.
- Whoever answers a buzz hears a short spoken prompt, then presses the door digit (9, or the building’s own digit) to open.
- The door digit is a tone the panel has to hear. When one press does not open a door, short pauses before the digit, or sending it twice, can. We built that fallback into our setup test.
Questions people ask
Is the door digit always 9 in Canada?
No. It is common enough that everybody quotes it, and some buildings use something else. The building sets it, so the building is the only reliable source.
Can I press it before answering?
No. The tone has to travel down a connected call. Answer, confirm who it is, then press and hold the digit for a moment.
It works sometimes. Why would it be intermittent?
Intermittent often points to the audio path rather than the digit. A route that adds hops between the panel and your phone can degrade the tone unpredictably. Test once with Wi-Fi calling off and with any forwarding removed.
My neighbour has the same problem. Whose fault is it?
If several units cannot open the door with the correct digit, it is the building. Report it together, because a shared report gets treated as a building fault rather than a resident question.
How do I find out my building digit if nobody answers my email?
Ask a long-standing neighbour, since it is the same for the whole building. With BuzzMeBro, the spoken prompt on each buzz names your building’s digit, so nobody has to remember it.
Sources
- Mircom, TX3 Telephone Access System User Guide - Keypad Configuration (LT-968)
- DoorKing, Installation/Owner’s Manual, Model 1802 & 1802EPD Telephone Entry System
- Internet Engineering Task Force (IETF), RFC 4733: RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals