When your business internet goes down, employees may immediately lose access to:
- Microsoft 365
- Cloud applications
- Microsoft Teams
- Hosted Voice or Teams Phone
- Customer relationship management systems
- Cloud accounting
- Online payments
- Remote access
- File storage
- Websites and online portals
How serious that becomes depends on how your organisation works.
A five-person business may experience an inconvenient interruption.
A 50-person cloud-based organisation could lose most of its ability to operate.
A contact centre may become unable to answer customer calls.
The outage might last:
- A few minutes
- Several hours
- A full working day
- Longer when physical fibre has been damaged
The most important point is this:
A faster internet connection does not prevent every outage. Business continuity depends on having an alternative route when the primary connection fails.
A leased line may offer faster repair targets than business broadband.
It can still go down.
The organisation should understand:
- Which services will stop
- Which services can continue
- How quickly the provider should respond
- How employees will work during the outage
- Whether calls and critical systems can use a backup connection
What causes business internet outages?
An outage can be caused by a problem inside your premises, within the provider’s network or somewhere between the two.
Common causes include:
- Fibre cable damage
- Roadworks
- Broadband line faults
- Carrier equipment failure
- Router failure
- Firewall failure
- Power cut
- Damaged network cabling
- Failed network switch
- DNS problems
- Provider outage
- Incorrect configuration
- Software update problems
- Human error
- Cyberattack
Employees may describe all of these as “the internet being down.”
The actual fault may be:
- The internet circuit
- The firewall
- The Wi-Fi
- One cloud application
- The local network
- The user’s computer
The first job is to identify the scope of the problem.
What will stop working during an internet outage?
The exact impact depends on which systems are cloud based.
Cloud email may become unavailable through office computers.
Employees may still access email using:
- Mobile data
- Home internet
- Another office
- A mobile hotspot
Messages normally remain stored in the cloud and should appear when connectivity returns.
Microsoft 365
Employees may lose access to:
- SharePoint
- OneDrive
- Teams
- Online Office applications
- Microsoft cloud administration
Some locally installed Office applications may continue to work.
Files stored only in the cloud may not be available unless they have been synchronised for offline use.
Cloud business applications
Systems such as the following may stop working:
- CRM
- Finance
- Payroll
- Housing management
- Case management
- Practice management
- Helpdesk
- Project management
- Document management
Where nearly every important system is cloud based, an internet outage can feel like a complete IT failure.
Website access
Employees may be unable to browse external websites.
The company website may remain online when it is hosted elsewhere.
Customers could still visit it even though employees in the office cannot.
Online payments
Card terminals and cloud payment systems may stop.
Some payment devices have mobile backup.
This should be confirmed and tested rather than assumed.
Remote access
Employees may be unable to reach:
- Office servers
- VPN services
- Remote desktops
- Site-to-site systems
Remote employees might also lose access to office-based services if the main office connection has failed.
What happens to Hosted Voice when the internet goes down?
Hosted Voice phones at the affected premises may stop making and receiving calls.
The cloud phone platform may remain fully operational.
The problem is that the office phones cannot reach it.
Possible continuity options include:
- Mobile applications using mobile data
- Calls diverted to employee mobiles
- Calls routed to another office
- Calls sent to home workers
- Provider-level diversion
- Voicemail
- External answering service
- Internet failover
Desk phones normally depend on:
- Internet
- Router
- Firewall
- Network switch
- Power
If any one of those components fails, the phones may stop even when the Hosted Voice platform is healthy.
What happens to Microsoft Teams Phone?
Employees connected through the failed office internet service may lose Teams Phone access.
They may continue working through:
- Teams mobile application using mobile data
- Home internet
- Another office
- Mobile hotspot
- A backup office connection
Incoming calls may still reach:
- Remote employees
- Mobile users
- Another site
- Voicemail
- A configured backup destination
The continuity plan depends on how call queues, mobile applications and failover have been configured.
Teams Phone does not automatically guarantee that every call will reach an alternative destination.
Will our business telephone numbers stop working?
Not necessarily.
Your numbers normally remain active within the carrier or cloud telephone platform.
What may stop is the ability of phones at the affected office to answer them.
Calls could be routed to:
- Other offices
- Mobile phones
- Remote workers
- Voicemail
- Answering service
- Temporary announcement
This needs to be configured before the outage or changed through a provider portal that can be accessed elsewhere.
If the only person with administrator access is inside the disconnected office, making changes may become difficult.
What happens to Microsoft Teams meetings?
Employees at the affected office may be unable to join or remain in meetings.
They might reconnect using:
- Mobile data
- Mobile hotspot
- Another internet connection
- Telephone dial-in, where available
- Another office
Employees already working remotely may remain unaffected.
This can create an uneven situation where external attendees and home workers can continue while the main office cannot.
Will Wi-Fi still show as connected?
It might.
A laptop can remain connected to the office Wi-Fi even when the internet service has failed.
The Wi-Fi symbol only confirms that the device is connected to the wireless network.
It does not prove the network has internet access.
This is why employees may see:
- Connected, no internet
- Pages failing to load
- Cloud applications timing out
- Teams disconnecting
Restarting the laptop will not normally fix a carrier outage.
How can we tell whether it is the internet or Wi-Fi?
Check whether:
- Wired computers are also affected
- Every Wi-Fi user is affected
- Several websites fail
- Cloud applications fail
- The firewall reports the circuit as down
- The internet provider shows an incident
When wired devices work but Wi-Fi devices do not, the problem may be:
- Wireless access point
- Wi-Fi controller
- Interference
- Authentication
- Network configuration
When all devices fail, the issue is more likely to involve:
- Internet circuit
- Router
- Firewall
- Core network switch
- Power
Could the firewall be causing the outage?
Yes.
The internet circuit may be working while the firewall has failed or become misconfigured.
Possible firewall problems include:
- Hardware failure
- Software crash
- Failed update
- Expired subscription
- Incorrect rule
- High resource use
- Power failure
- Damaged interface
A carrier test may show that its circuit is healthy.
That does not mean employees can access the internet.
Support responsibility must cover the connection and the equipment behind it.
Could the router be the problem?
Yes.
A failed router can disconnect the entire organisation.
Possible symptoms include:
- No internet for any device
- Carrier circuit appears active
- Router lights show an error
- Backup service does not activate
- Public IP becomes unreachable
The provider should confirm:
- Who owns the router
- Who monitors it
- Who can replace it
- What replacement target applies
- Whether a spare is available
A four-hour leased-line repair target provides little protection when the router takes two days to replace.
Could a power cut cause an internet outage?
Yes.
The external carrier network may remain operational while equipment inside your premises loses power.
This may include:
- Fibre termination equipment
- Router
- Firewall
- Network switches
- Wi-Fi access points
- Computers
- Desk phones
A UPS may keep critical equipment operating during a short power cut.
It does not provide unlimited runtime.
Longer outages may require:
- Generator
- Mobile devices
- Home working
- Another office
- Cloud call diversion
Could roadworks disconnect our business?
Yes.
Construction workers may accidentally damage:
- Fibre
- Copper cable
- Underground ducts
- Street cabinets
- Power supplies
Physical fibre damage may take longer to repair than a software or equipment fault.
The provider may need to:
- Locate the break
- Obtain access
- Excavate the route
- Replace cable
- Splice fibre
- Test the circuit
A second service using the same physical duct could fail at the same time.
Will a leased line prevent an outage?
No.
A leased line may provide:
- Dedicated bandwidth
- Better monitoring
- Stronger service levels
- Faster escalation
- Shorter target repair time
It can still fail.
A single leased line remains a single connection.
A business that cannot tolerate downtime should also consider:
- Business broadband backup
- Second leased line
- 4G or 5G failover
- Fixed wireless
- Alternative carrier
- Physically diverse route
[Read: Business Broadband vs Leased Line]
How long will an internet outage last?
It may last from minutes to days.
The duration depends on the cause.
Short outage
May involve:
- Temporary provider issue
- Router restart
- Brief power interruption
- Automatic failover
Several-hour outage
May involve:
- Carrier equipment failure
- Router or firewall replacement
- Local network problem
- Engineer visit
Full-day or multi-day outage
May involve:
- Damaged fibre
- Civil engineering
- Difficult site access
- Widespread network incident
- Replacement hardware delays
The service-level agreement should state the provider’s response and repair targets.
A target is not the same as a guarantee that every fault will be fixed within that period.
What should we do first when the internet goes down?
Confirm the scope
Check:
- One user or everyone?
- One application or all services?
- Wi-Fi only or wired devices too?
- One office or several sites?
- Internet only or power as well?
Check the equipment
Look for obvious problems with:
- Router
- Firewall
- Network switches
- Fibre termination equipment
- Power
- UPS
Do not repeatedly reset equipment unless your IT provider instructs you to.
Restarting equipment can remove useful fault information or interrupt failover.
Contact the support provider
Provide:
- Site
- Time the problem began
- Number of users affected
- Services affected
- Any error messages
- Whether power is available
- Whether backup has activated
Activate continuity procedures
Move essential work to:
- Mobile data
- Home working
- Another site
- Backup connection
- Alternative telephone routing
Who should we contact during an outage?
The organisation should have one clear support route.
Possible parties include:
- Managed IT provider
- Internet provider
- Telecoms provider
- Firewall provider
- Internal IT team
- Building manager
- Electricity supplier
Employees should not be expected to determine which supplier owns the fault.
A managed provider should diagnose and coordinate the incident.
The support process should define:
- Who opens the fault
- Who owns updates
- Who escalates
- Who changes call routing
- Who communicates with employees
- Who closes the incident
What information will the provider need?
Be ready to supply:
- Account or circuit reference
- Affected address
- Contact name
- Contact telephone number
- Time of failure
- Services affected
- Equipment status
- Power status
- Actions already taken
- Site-access information
- Business impact
The provider may carry out remote tests before arranging an engineer.
Should employees reboot the router?
Not without guidance.
A controlled restart may fix some equipment faults.
Repeated reboots may:
- Delay diagnosis
- Clear logs
- Interrupt backup activation
- Damage configuration
- Create uncertainty about the original fault
Employees should follow a documented process.
Critical network equipment should not be treated like a home broadband router.
What is internet failover?
Internet failover automatically moves traffic to another connection when the main service fails.
The backup might use:
- 4G
- 5G
- Business broadband
- Second leased line
- Fixed wireless
- Satellite
The firewall or router detects the failure and switches traffic.
When the primary connection returns, traffic may move back automatically.
[Explore Internet Failover]
Does failover happen instantly?
Not always.
Failover may take:
- A few seconds
- A minute or two
- Longer when manual action is required
Existing sessions may disconnect.
This can affect:
- Voice calls
- Video meetings
- VPNs
- Remote desktops
- Cloud applications
- Online payments
New sessions should then use the backup connection.
A backup service should be tested with real applications.
Will active phone calls stay connected during failover?
They may drop.
When internet traffic moves to the backup connection, the public IP address and network path may change.
An active Hosted Voice or Teams call could disconnect.
Employees may need to redial.
New calls should then use the backup service if:
- The firewall has failed over correctly
- The backup has enough capacity
- Voice traffic is permitted
- The provider supports the route
The goal of failover is usually to restore service quickly, not guarantee that every active session survives.
How fast should the backup connection be?
It does not always need to match the primary service.
A 1 Gbps leased line might be backed up by:
- 100 Mbps business broadband
- 200 Mbps Full Fibre
- 4G or 5G service
During the outage, the organisation may prioritise:
- Voice calls
- CRM
- Microsoft 365
- Essential cloud applications
- Payments
It may temporarily restrict:
- Guest Wi-Fi
- Cloud backups
- Streaming
- Software downloads
- CCTV uploads
- Non-essential traffic
The backup should support critical work rather than every normal activity.
Is 4G or 5G a good backup?
It can be a good option for smaller offices.
Advantages may include:
- Fast deployment
- Separate mobile network
- Lower cost
- Automatic failover
- No second fixed circuit required
Disadvantages may include:
- Variable signal
- Local congestion
- Building interference
- Data limits
- Lower upload speed
- Changing public IP
- Reduced performance for many users
The service should be tested inside the building and during busy hours.
Is business broadband a good leased-line backup?
Yes.
A business broadband connection may provide:
- Higher capacity than mobile backup
- Stable fixed connectivity
- Lower monthly cost than a second leased line
- Support for most business systems
The provider should check whether it shares infrastructure with the leased line.
A broadband service from a different brand may still use:
- The same duct
- The same exchange
- The same physical cable route
- The same building entry point
Logical provider diversity is not always physical diversity.
Should we have a second leased line?
A second leased line may be justified where an outage would have a severe impact.
This may include:
- Contact centres
- Financial services
- Healthcare
- Emergency support
- Major customer-service operations
- Large cloud-dependent offices
The second line should ideally use:
- Another carrier
- Another physical route
- Another building entry point
- Another network node
True diversity can be expensive and may require detailed route surveys.
What is a diverse internet connection?
A diverse connection follows a physically different route from the primary service.
For example:
- Primary fibre enters the front of the building
- Backup fibre enters the rear
- Each uses a different carrier network
- Each follows different street ducts
This reduces the risk that one cable cut affects both services.
The provider should explain and document the actual diversity.
The word “resilient” by itself is not enough.
Can employees work from home during an outage?
Possibly.
Home working may provide an effective temporary option when:
- Applications are cloud based
- Employees have suitable devices
- Security controls are in place
- Home internet is available
- Teams and Hosted Voice mobile services are configured
- Employees know the procedure
The organisation should decide in advance:
- Who can go home
- Which teams must remain on site
- How calls will be handled
- How employees will be informed
- Which security rules apply
Waiting until the outage begins creates confusion.
Can employees use mobile hotspots?
Yes, for temporary individual access.
A hotspot may support:
- Cloud applications
- Teams
- Basic voice and video
- Urgent work
Possible risks include:
- Personal data use
- Weak signal
- Security
- Battery drain
- Limited capacity
- Unmanaged devices
- Inconsistent performance
A managed mobile backup is normally better than asking employees to use personal phones.
What happens to remote workers when the office internet fails?
They may be unaffected when they connect directly to cloud services.
They may be affected when they rely on:
- Office VPN
- Office servers
- On-site applications
- Central firewall
- Remote desktop hosted at the office
- Office telephone equipment
A cloud-first organisation may have better location resilience because employees do not depend on one building.
This does not remove the need for security and continuity planning.
Will our data be lost during an outage?
Usually not because of the internet outage alone.
Cloud data normally remains stored within the application provider’s environment.
Unsaved work may be lost when:
- The application cannot synchronise
- A browser session ends
- The computer shuts down
- The file was not saved locally
- The user was working in a live cloud form
Offline files may synchronise when connectivity returns.
An internet outage is not the same as a backup failure.
The organisation still needs independent data protection.
Will incoming emails be lost?
Normally not.
The email provider continues receiving and storing messages.
Employees may be unable to access them from the affected location.
Messages should appear when connectivity returns or when users connect through mobile data or another location.
Will our website go offline?
Not necessarily.
A website hosted in a cloud platform or data centre should remain online when the office internet fails.
The website may go down if it is hosted:
- On a server in the office
- Through the failed business connection
- Behind the office firewall
Most modern businesses should avoid hosting public websites solely from one office internet connection.
What happens to site-to-site connections?
Connections between offices may fail when they depend on the affected internet service.
This could interrupt access to:
- Shared servers
- Central applications
- Printers
- Telephony
- CCTV
- Building systems
A multi-site organisation may need:
- Independent internet at each site
- SD-WAN
- Automatic VPN failover
- Cloud-hosted applications
- Multiple carrier routes
One head-office outage should not necessarily disconnect every branch from essential systems.
Could cybersecurity controls stop working?
Some controls may be affected.
For example:
- Cloud DNS filtering
- Security monitoring
- Cloud authentication
- Remote management
- Software updates
- Cloud backups
Local protections such as endpoint security may continue.
A backup connection should preserve essential security controls.
The organisation should not disable the firewall or bypass protections simply to restore access quickly.
Could an outage be a cyberattack?
Yes, although many outages have ordinary technical causes.
Possible attacks include:
- Denial of service
- Firewall compromise
- Router attack
- DNS attack
- Ransomware affecting network equipment
- Provider attack
Warning signs may include:
- Unusual traffic
- Several systems failing
- Security alerts
- Administrator lockout
- Configuration changes
- Repeated disruption
The IT provider should determine whether the incident is operational, security related or both.
How should we communicate with employees?
Use an alternative channel that does not depend on the failed office connection.
Possible channels include:
- SMS
- Mobile call
- External status page
- Pre-agreed messaging application
- Manager phone tree
- Mobile email
The update should explain:
- What has happened
- Which sites are affected
- What employees should do
- Which services remain available
- Whether home working is required
- When the next update will be issued
Avoid speculation.
Employees need clear instructions more than technical detail.
How should we communicate with customers?
Customer communication may be needed when the outage affects:
- Telephone answering
- Online services
- Deliveries
- Support
- Appointments
- Payments
- Response times
Possible options include:
- Website notice
- Social media
- Recorded telephone announcement
- SMS
- Alternative telephone number
- Status page
The message should be honest without exposing unnecessary technical or security information.
How much can an internet outage cost?
The cost may include:
- Lost employee time
- Missed sales
- Unanswered calls
- Delayed customer service
- Payment disruption
- Overtime
- SLA penalties
- Management time
- Reputation
- Recovery work
A simple productivity estimate can be useful.
For example, when 50 employees lose four hours of productive work, the employment cost alone may be substantial.
The wider cost may be higher when customers cannot contact the organisation.
This is why backup connectivity should be compared with the cost of downtime rather than only the cost of the primary circuit.
Does the provider compensate us?
Possibly.
A business internet or leased-line contract may include service credits when certain service levels are missed.
The agreement may specify:
- Availability target
- Repair target
- Response target
- Credit calculation
- Maximum credit
- Exclusions
- Claim process
The credit is normally based on the service charge.
It may not reflect the organisation’s actual business loss.
A £100 credit does not compensate for thousands of pounds in lost productivity.
What does a four-hour fix mean?
Read the wording carefully.
It may mean:
- Target repair within four hours
- Engineering response within four hours
- Fault update within four hours
- Clock runs only during service hours
- Certain incidents are excluded
The agreement may also pause the clock while waiting for:
- Site access
- Customer action
- Landlord permission
- Power restoration
- Third-party work
Ask the provider to explain the repair commitment in plain English.
Should we monitor the internet connection?
Yes.
Monitoring may detect:
- Complete outage
- Packet loss
- Latency increase
- Intermittent service
- Backup activation
- Router failure
- Capacity problems
A managed provider may know the service is failing before employees report it.
Monitoring should cover:
- Primary connection
- Backup connection
- Router
- Firewall
- Critical network equipment
A backup service that has quietly failed provides no protection.
How often should failover be tested?
At least periodically and after significant network changes.
Testing may include:
- Simulate loss of the primary connection
- Confirm the backup activates
- Test essential applications
- Test voice calls
- Confirm monitoring alerts
- Restore the primary connection
- Confirm normal routing returns
The organisation should not discover during a real outage that:
- The SIM has expired
- Mobile data is disabled
- The firewall rule is wrong
- The backup router has failed
- Voice traffic is blocked
What should be included in an internet outage plan?
The plan should identify:
- Critical services
- Primary provider
- Support contact
- Circuit reference
- Backup connection
- Failover process
- Telephone diversion process
- Employee communication
- Customer communication
- Home-working process
- Manual workarounds
- Escalation contacts
- Provider responsibilities
- Recovery testing
- Incident review
The plan should be short enough to use during a stressful incident.
What manual workarounds should we prepare?
Depending on the organisation, these may include:
- Paper contact lists
- Mobile telephone numbers
- Offline forms
- Manual payment process
- Printed schedules
- Local copies of critical documents
- Alternative customer-contact procedure
- Emergency supplier details
- Another working location
Manual processes should be temporary, controlled and reconciled when systems return.
Which businesses need internet failover most?
Failover should be considered seriously by organisations that rely on the internet for:
- Customer calls
- Cloud applications
- Online payments
- Contact centres
- Healthcare systems
- Housing services
- Legal deadlines
- Financial work
- Manufacturing
- Remote access
- Multi-site operations
The need is driven by impact, not headcount.
A six-person online retailer may depend on the internet more than a much larger business with local systems.
Does a small business need failover?
It may.
A small business should ask:
- Can we still take calls?
- Can we access customer records?
- Can we take payments?
- Can employees work from home?
- How much would a day offline cost?
- Is mobile signal reliable?
A managed 4G or 5G backup may provide affordable protection.
The small business may not need a second leased line.
What backup does a 50-person business need?
A 50-person cloud-dependent business may consider:
- Business broadband backup to a leased line
- Second Full Fibre service
- 5G for reduced essential operation
- Second leased line for critical environments
The backup should be sized around:
- Essential user count
- Voice calls
- Cloud systems
- Video restrictions
- Office size
- Cost of downtime
It should also be automatic where possible.
What backup does a contact centre need?
A contact centre may need:
- Second fixed connection
- Different carrier
- Different physical route
- Automatic firewall failover
- Cloud call routing
- Remote-agent option
- Power protection
- Regular testing
Mobile backup alone may be insufficient for a large number of agents.
The contact-centre platform should also be configured to route calls elsewhere if the site becomes unavailable.
Common mistakes businesses make
Assuming a leased line cannot fail
Every circuit can fail.
Buying speed without buying resilience
A faster connection does not provide an alternative route.
Using an untested mobile router
The backup may not work when needed.
Using the same carrier and route for both connections
One cable cut may affect both.
Ignoring router and firewall failure
The carrier circuit may be healthy while the office remains offline.
Having no call-diversion plan
Customers cannot reach the organisation.
Keeping the support details only in the cloud
Nobody can access them during the outage.
Allowing everyone to use the backup normally
Non-essential traffic overwhelms it.
Cancelling the old service too quickly
The new connection has no safety net.
Failing to review the incident
The same outage causes the same disruption again.
Questions to ask your internet provider
- What happens when our primary service fails?
- How will you detect the outage?
- Who opens the carrier fault?
- What repair target applies?
- Is the repair target available 24 hours a day?
- What events are excluded?
- What updates will we receive?
- Who supports the router?
- Who supports the firewall?
- What backup connection do you recommend?
- Will failover be automatic?
- How long will failover take?
- Will active calls disconnect?
- Which systems will work on backup?
- Does the backup use another carrier?
- Does it use another physical route?
- How often will it be tested?
- Can calls be routed to mobiles or another site?
- What happens during a power cut?
- Who takes overall ownership?
Warning signs to watch for
Be cautious when a provider:
- Says the internet will never go down
- Describes a repair target as guaranteed uptime
- Does not discuss backup connectivity
- Cannot explain the physical route
- Assumes two brands mean two separate networks
- Does not monitor the backup
- Provides no failover test
- Supports the circuit but not the firewall
- Cannot change call routing during an outage
- Has no out-of-hours escalation
- Provides no incident communication process
- Recommends a backup without testing mobile signal
- Focuses only on service credits
What happens when your business internet goes down?
The technical answer is that the connection between your organisation and the internet has failed.
The business answer may be much more serious.
Employees may be unable to:
- Access cloud systems
- Answer customer calls
- Send email
- Process payments
- Join meetings
- Work remotely
- Reach other offices
A strong internet provider should help restore service quickly.
A strong continuity plan should stop the organisation from waiting helplessly for that repair.
The most effective approach normally combines:
- Reliable primary connection
- Suitable backup service
- Automatic failover
- Cloud telephone routing
- Power protection
- Clear support ownership
- Tested employee procedures
Plan for the outage before it happens
Internet failure is no longer a minor inconvenience for many organisations.
It may stop almost every important business process.
The time to decide how employees will work, how calls will be answered and who will contact the carrier is before the connection goes down.
Stratiis can review your existing internet circuit, Hosted Voice, Teams Phone, firewall, mobile coverage, backup connectivity and business-continuity requirements.
We can then help you design and test:
- Business broadband backup
- Leased-line resilience
- 4G or 5G failover
- Dual-carrier connectivity
- Cloud call diversion
- Firewall failover
- UPS protection
- Internet outage procedures
Book a Business Internet Resilience Review
Call: 0141 348 7960
Email: sales@stratiis.com
