Robocall
A robocall is an automated telephone call delivering a pre-recorded or synthesised message. Vendors prefer "voice broadcast" because the public term carries hostility. The mechanics are the same, and understanding them explains most of the complaints districts receive.
| Step | What the system does | Where it breaks |
|---|---|---|
| 1. Dial | Places the call from the district's caller ID | Unrecognised caller ID goes straight to a spam filter |
| 2. Answer detection | Decides whether a human or a machine picked up | The single largest source of complaints — see below |
| 3. Branch | Plays the live-answer version, or waits for the voicemail beep | Playing before the beep truncates the opening sentence |
| 4. Playback | Plays the recording or synthesised speech | Voicemail cut-offs, typically at 30–60 seconds |
| 5. Repeat option | Offers "press 1 to hear this again" | Not offered, so a half-heard message cannot be recovered |
| 6. Result | Records answered, machine, busy, no answer, failed | "Answered" counted as "heard" |
Answering-machine detection, and why messages get cut off
Step two is the interesting one. The system has a few hundred milliseconds of audio and has to guess whether it is talking to a person or a machine. A person says "hello" and stops. A voicemail greeting runs longer and ends with a beep. Detection algorithms listen for that shape.
They are wrong regularly, in both directions, and each error has a signature families recognise:
- Human misread as machine. The parent says hello and hears silence while the system waits for a beep that never comes. This is the "the school called and nobody was there" complaint, and it is the origin of most of them.
- Machine misread as human. Playback starts during the greeting, so the voicemail records only the second half. The family hears "…will be closed tomorrow" with no indication of which school or why.
- Carrier voicemail cut-off. Many systems cap recordings at 30 to 60 seconds. A 55-second message plus a slow greeting equals a truncated one.
The mitigations are all in the script, not the technology. Front-load the essential information — who is calling and what is happening, in the first eight seconds. Repeat the critical detail at the end, because one of the two will survive. Keep it short enough to fit inside a short voicemail box.
| Target duration | Approximate words | Fits a 30-second voicemail box? |
|---|---|---|
| 20 seconds | 45–50 | Yes, comfortably |
| 30 seconds | 70–75 | Only if the greeting is short |
| 45 seconds | 105–110 | Frequently truncated |
| 60 seconds | 140–150 | Usually truncated |
When voice is the right channel and when it is not
Voice is slower, more expensive per recipient than text, and more annoying. It is also the only channel that reaches some households, which is why districts keep it.
| Scenario | Better channel | Reason |
|---|---|---|
| Lockdown in progress | SMS first, voice behind it | Speed, and a ringing phone in a quiet room is a hazard |
| Snow day at 05:30 | Voice and SMS together | Voice wakes people; a text at 05:30 does not |
| Daily attendance notice | SMS | Volume; a daily call becomes noise within a fortnight |
| Fundraiser or event | Never worth an interruption | |
| Guardian with a landline only | Voice | The only channel available |
| Household without a data plan | Voice or SMS | Email and app notifications are not viable |
| Caregiver with limited literacy | Voice, in their language | A written notice does not communicate |
| Deaf or hard-of-hearing guardian | Never voice-only | Text or email must carry the same content |
Kastr fails SMS over to voice on terminal failure and records the linkage, which covers the common case of a landline sitting in a mobile field. We do not offer press-1-to-connect IVR trees or inbound call routing; if an automated attendant is part of your requirement, we do not meet it.
The legal position, briefly
Automated calls to residential and mobile numbers are governed by the TCPA. School-related calls to numbers families gave the school sit on reasonable footing, and emergency notifications sit on the strongest footing of all. Promotional and third-party calls do not benefit from that reasoning at all, and a fundraising robocall to a list assembled for attendance purposes is the sort of thing that produces a complaint with substance behind it.
Three operational points follow. Honour quiet hours for anything that is not an emergency. Make sure the caller ID is the district's own, published and consistent, because an unrecognised number is filtered before anybody hears it. And offer an opt-out path for routine voice traffic that does not require the parent to opt out of everything.
One thing worth checking in your own logs. What proportion of your voice calls are recorded as answered by machine? If it is above about two-thirds, voice is functioning as a voicemail-delivery channel rather than a live-contact channel, which is fine — but it means the script needs to work as a standalone recording, and it means the emergency plan should not assume voice reaches anyone in the first five minutes.
Questions people actually ask
Are school robocalls legal under the TCPA?
School-related automated calls to numbers families provided to the school sit on solid consent footing, with emergency notifications strongest. Promotional and third-party calls do not benefit from that reasoning. The boundary is the purpose of the message, not the identity of the sender, and it is worth having counsel draw it explicitly.
Why do robocalls sometimes cut off on voicemail?
Two causes. Answering-machine detection can start playback before the beep, losing the opening; and carrier voicemail boxes often cap recordings at 30 to 60 seconds, cutting the end. Front-load the essential facts in the first eight seconds and repeat the critical detail at the close.
When is a voice call better than a text message?
When the message must wake someone, when the household has a landline or no data plan, when a caregiver has limited literacy, or when the content needs to be heard in a language a family reads less confidently than they speak. For daily high-volume notices, voice becomes noise quickly.
Can a robocall reach a landline that has no text capability?
Yes, and that is the main reason districts keep voice. It is also why phone type matters in the roster: a landline recorded in a mobile field produces silent SMS failures. Platforms that fail SMS over to a voice call degrade gracefully instead of losing the family.
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