Off-Air Alerts: Reach Broadcast Engineers in Seconds
When your transmitter drops signal at 3am, seconds matter. Send SMS off-air alerts from any broadcast monitor (Inovonics, Burk, Broadcast Tools, Davicom) or automation system that emails alarms today. Replace the shutdown @txt.att.net, @tmomail.net, and @vtext.com carrier gateways your silence sensors used for years. Your chief engineer and on-call tech get notified on their phones, not buried in an inbox.
Challenges
Why Off-Air Alerts Fail to Reach Broadcast Engineers
FM, AM, LPFM, college, religious, public radio, and TV operators share the same five problems: carrier email-to-SMS gateways have shut down, alert email rots in an inbox overnight, one-recipient SMTP fields cap fan-out, and silent failure on a silence sensor goes unnoticed until a listener calls.
Carrier Email-to-SMS Gateways Have Shut Down
T-Mobile’s @tmomail.net (late 2024) and AT&T’s @txt.att.net (June 17, 2025) are dead, and Verizon’s @vtext.com is phasing down through March 2027 with rising silent drops. Stations still pointing alerts at those addresses have a broken or breaking path.
3am Dead Air Goes Unnoticed Until Morning
The off-air monitor catches silence in 9 seconds and sends an email alert. The chief engineer’s phone is on the nightstand on silent. The on-call tech is asleep in the next town over. Two hours and forty minutes of unmodulated carrier later, the morning show host driving in is the first to notice.
Silent Failure on a Silence Sensor
If the off-air monitor itself dies, you see something visibly wrong. If the monitor’s email lands but delivery to SMS dies downstream, the monitor looks healthy with a green light on the panel and your engineering team has no idea they are flying blind. Weeks of silent-fault alerts can fail without anyone knowing.
One Phone per SMTP Recipient on Legacy Gateways
Carrier gateways accepted one phone per recipient field. If the primary on-call engineer was unreachable, in a dead cell zone, or asleep, the alert sat in email until someone else looked. Chief engineers, on-call techs, assistant engineers, and GMs could not be notified in parallel from a single fault.
Chief Engineers Stretched Across Multiple Sticks
Chief engineers, contract engineers, and regional broadcast engineers commonly cover 2-3 stations or entire small clusters with hours of windshield time between transmitter sites. Without SMS to the phone, an off-air event at the second stick during drive time on the first cannot be caught fast enough to matter.
Listeners Become the First Sign of a Fault
By the time anyone notices, weeks of silent-fault alerts may have failed to reach anyone. The first sign is a listener complaint, a morning-show host asking why Saturday overnight was dead air, or a GM noticing a spike in why-wasn’t-this-caught emails. The reputational damage is done before the engineer is even told.
Solution
How TextBolt Solves Off-Air Alert Delivery
TextBolt is a registered, 10DLC-compliant email-to-SMS gateway built to replace the carrier gateways broadcasters relied on for two decades. Your monitor, your thresholds, your alert templates stay exactly as they are. Only the SMTP recipient address changes.
Instant SMS Off-Air Alert Delivery
Off-air alerts arrive as text messages typically within 10-30 seconds of fault detection. Engineers read them on phones, not buried in an email inbox they check the next morning.
Fan Out to Multiple Engineer Phones
One alert reaches the chief engineer, on-call tech, and GM at once, with up to 10 team members on Standard or Professional plans at no per-phone charge.
Works With Any Broadcast Monitor
Inovonics, Burk, Broadcast Tools, Davicom, Omnia, Wheatstone, Telos Axia, Nautel, GatesAir, and any other broadcast monitor sold in the last two decades that can send an SMTP alert.
Carrier-Trusted, 10DLC-Compliant Sender
TextBolt issues a registered business toll-free number for every account. Off-air alerts deliver as legitimate business SMS, not flagged as spam like consumer-grade short codes. The same number sends every alert so engineers recognize it instantly as a monitoring alert.
No Rack Changes, No Monitor Replacement
The change is one line: your monitor’s SMTP recipient address. Replace 5551234567@txt.att.net with +15551234567@sendemailtotext.com. Your monitor, broadcast automation, transmitter SMTP traps, thresholds, escalation rules, and alert templates stay exactly as they are.
Audit Trail and Delivery Confirmations
Every off-air alert is timestamped and searchable: sender, recipient, delivery status, full alert body. Carrier gateways silently dropped alerts and truncated messages. TextBolt logs every send with the full alarm body preserved for FCC documentation, internal review, and dispute resolution.
Getting Started
Migrate From a Carrier Gateway in About 30 Minutes
Total hands-on time, including a live silence injection to confirm the text arrives, is well under an hour. No developer, no rack work, no new hardware.
1
Sign Up for TextBolt
Create your account, list the engineers who should receive off-air alerts, and choose your plan. Solo stations start on Basic ($29/month). Clusters on Standard ($49/month).
2
Get Your Business Toll-Free Number
TextBolt assigns a dedicated business number and a matching gateway address in the format +1[phone]@sendemailtotext.com. The same number sends every off-air alert from your station group.
3
Complete 10DLC Business Verification
Submit your business documents for 10DLC compliance so SMS sends from a carrier-trusted business sender, not a flagged short code. Approval typically takes 24-48 hours.
4
Update the SMTP Recipient on Your Monitor
In your monitor’s alert recipient field, replace the legacy carrier-gateway address with +1[phone]@sendemailtotext.com. Same phone number, only the domain changes.
5
Inject a Test Silence
Press your monitor’s Send Test Alert button or physically mute studio audio for 30 seconds. The off-air SMS arrives on the engineer’s phone within 10-30 seconds. Confirm the alert body, threshold, and station identifier read correctly.
6
Add Fan-Out Recipients
Add additional +1[phone]@sendemailtotext.com recipients for the on-call tech, assistant engineer, and GM as a silent backup. Most monitors accept a comma-separated list or one row per recipient.
Process
Three Ways to Send Off-Air Alerts as SMS
Automated From Your Monitor
Your off-air monitor or broadcast automation system already emails alerts on silence, low modulation, RF loss, exciter fault, STL link loss, or a tripped mains breaker. Examples: Inovonics 610, Burk ARC Plus, Broadcast Tools SSM-1, Davicom Cortex, Nautel NX, GatesAir Flexiva, WideOrbit, NexGen, Enco. Point the SMTP recipient at your gateway address (format: +15551234567@sendemailtotext.com) and every alert email becomes an SMS automatically.
Manual From Any Email Client
Volunteer-staffed LPFM, college, or small religious operations without a network-attached monitor: chief engineer composes a station-status alert from any email client (Gmail, Outlook, Apple Mail, Thunderbird, or others). Address to the recipient phone plus the gateway, for example +15551234567@sendemailtotext.com, and hit send. Useful for tower-crew dispatch and EAS acknowledgements.
Email Forwarding (Locked-Down Systems)
If your monitor or vendor appliance has a hard-coded SMTP destination it sends to, set up a forwarding rule on the receiving inbox (Office 365, Google Workspace, your station MTA). Alerts land in the inbox, auto-forward to the TextBolt gateway, and convert to SMS without touching the monitor’s locked configuration.
Use Cases
Off-Air Alerts SMS for Every Broadcaster
From two-station FM operators in secondary markets to multi-state public radio networks, TextBolt delivers off-air alerts engineers actually see in time to act.
Small & Mid Commercial FM and AM
Two- or three-station clusters in secondary and tertiary markets. One chief engineer covering multiple sticks with hours of windshield between them. Off-air SMS to the phone is the only way to catch a 3am fault before drive-time wakes up.
LPFM & Non-Commercial Stations
Volunteer engineering, small budgets, no room for $10K enterprise monitoring suites. Free off-air-to-SMS via the carrier gateways was how these stations stayed on air, and it broke first. TextBolt is the drop-in replacement at $29/month.
College & University Radio
Staff-supervised, student-operated. Faculty advisor or part-time contract chief engineer. A text alert means call the student on shift right now. An email alert means see it Monday morning, when the dean already has questions.
Religious Broadcasters
Multi-station networks with regional or outsourced engineers. Off-air during Sunday morning services is a donor-facing event. SMS off-air alerts let the engineer dial in to the remote-control system from anywhere and bring the transmitter back fast.
Public Radio & NPR Affiliates
Membership-funded, politically visible, held to high uptime standards. SMS to the engineering team is standard practice. The question is only how it is implemented now that the carrier gateways are gone. TextBolt fills the gap with a registered business sender and per-alert audit trail.
TV Translators, LPTV & Streaming
TV translators and LPTV are often unattended at the transmitter site. Streaming-only operators monitor encoder silence, stream disconnects, and CDN origin alarms. Same two-hop pattern: any system that emits an SMTP alert can deliver that alert as an SMS.
Comparison
How TextBolt Compares to Carrier Gateways and Custom SMS APIs
Free carrier gateways are shut down or silently failing. Custom Twilio integrations need developer time and per-message fees on top of a monthly minimum. TextBolt is a drop-in email-to-SMS gateway: your existing monitor gains reliable SMS without rack changes, code, or a per-message line item.
Legacy Carrier Gateways
@txt.att.net, @tmomail.net, @vtext.com
The free email-to-SMS path broadcasters used for 20 years. Shut down or deprecated. Silently drops alerts, truncates message bodies, accepts one phone per recipient field.
- T-Mobile shut down late 2024
- AT&T shut down June 17, 2025
- Verizon phasing through March 2027
- One phone per recipient
- Aggressive spam filtering
- No audit trail
Recommended
TextBolt
$49/month (Standard plan)
Email-to-SMS gateway built for broadcast alerting. Your existing monitor’s SMTP alert email becomes an SMS. Nothing in the rack changes; an SMS capability gets added on top.
- Multi-user access: up to 10 members
- 10DLC compliant business sender
- Fan-out to multiple engineer phones
- 30 minute setup
- Works with any monitoring tool
- Up to 98% delivery rate*
Custom Twilio / SMS API Build
$15-100+/month minimum + per-message fees + dev time
Roll your own SMS gateway against a generic SMS API. Your monitor still only emits email, so you also build an email-to-API bridge. Powerful and flexible, but heavy lift for a station group.
- Requires developer time
- Email-to-API glue layer to maintain
- Per-message fees on top of monthly minimum
- You own carrier registration and compliance
Benefits
Why Broadcasters Pick TextBolt for Off-Air Alerts
Carrier-trusted SMS, fan-out to every engineer who should know, and a price built for FM/AM/LPFM/college budgets, not enterprise dashboards.
Up to 98%
Delivery Rate
30 min
Setup Time
$29/mo
Basic Plan Starting Price
10-30 sec
Alert Arrival Time
Frequently Asked Questions
Got questions? We’ve got answers.
Does TextBolt work with my Inovonics, Burk, Broadcast Tools, Davicom, or other broadcast monitor?
Yes, essentially always. TextBolt does not need to integrate with your monitor. If your monitor can send an email alert (which virtually every Inovonics, Burk, Broadcast Tools, Davicom, Nautel, GatesAir, or automation system from the last two decades can), you can convert that alert into an SMS.
Do I need to replace my monitoring hardware or rewire the rack?
No. Just swap the SMTP recipient address in your monitor’s alert settings: replace 5551234567@txt.att.net with +15551234567@sendemailtotext.com. Same phone number, different domain. Total hands-on time including a test silence injection is well under an hour.
What happens if my AT&T, T-Mobile, or Verizon gateway is still in place today?
It is silently failing. T-Mobile’s @tmomail.net shut down in late 2024, AT&T’s @txt.att.net shut down on June 17, 2025, and Verizon’s @vtext.com is phasing down through March 2027 with rising failure rates. Alerts to those addresses bounce or are dropped without delivery. If you have not injected a test silence end-to-end in the last 30 days, do it today.
How fast does the off-air text arrive after the fault is detected?
Typically 10-30 seconds end to end. Your monitor’s alert email goes out within ~5 seconds, and TextBolt-to-carrier delivery on registered business senders is also under 5 seconds. On a 10-second silence threshold, the engineer has a text in hand within 20-40 seconds.
Can I send the alert to more than one engineer at once?
Yes, and this is a major upgrade over carrier gateways, which capped at one phone per recipient field. A single alert can fan out in parallel to the chief engineer, the weekend on-call tech, an assistant for escalation, and the GM as a silent fallback. Standard and Professional plans include shared access for up to 10 team members at no per-phone charge.
Does the SMS include the alarm name, station identifier, and threshold that tripped?
Yes. The text carries your monitor’s full alert email body, unlike carrier gateways which often truncated. If the email reads “KXXX-FM silence detected at 03:07:14, duration 12 seconds, below -45 dBFS threshold,” that is what lands on the engineer’s phone, segmented across multiple SMS if it runs past 160 characters.
Does this work for TV, LPTV, translators, and streaming, not just radio?
Yes. The email-to-SMS pattern works for any system that can emit an SMTP alert: FM, AM, HD Radio, HD2/HD3 multicast, TV master control, LPTV translators, automation platforms (WideOrbit, NexGen, ScheduALL), and streaming encoders (Liquidsoap, Icecast, Wowza). All are handled identically.
How is TextBolt different from the carrier gateways or an enterprise broadcast monitoring suite?
TextBolt is an email-to-SMS gateway, not a dashboard or phone-based texting service. Carrier gateways were free but are shut down or silently failing. Enterprise broadcast suites at $10K+ replace your monitor and rack gear. TextBolt sits on top of the monitor you already run, so your existing tools gain SMS without any workflow replacement.
Can I use this for adjacent broadcast workflows like tower-crew dispatch or EAS acknowledgement?
Yes. Off-air alerts are one use case for TextBolt’s general business-SMS platform. Tower-crew dispatch, EAS activation acknowledgements, encoder silence alerts, CDN origin alarms, and broadcast log delivery all fit the same email-to-SMS pattern and are covered by the same plan.