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Nuisance calls, telemarketers, robocalls — every business deals with callers they would rather not hear from, and each unwanted call wastes time, breaks concentration, and blocks the line for real customers, disrupting normal business operations.
CallFactory’s call filter gives you full control over who gets through to your team, allowing you to block specific numbers, allow only authorised callers, or reroute certain numbers to a different destination.
- Block individual numbers or number ranges
- Allow only authorised callers (whitelist mode)
- Reroute specific callers to a different destination
- Trace and block anonymous callers
Benefits of call filter
See how our smart tools help your team work more efficiently, save valuable time, and elevate the way your business communicates.
Authorised callers only
Your colleagues deal only with authorised callers — customers, partners, and suppliers who belong on the line, so the difference in professionalism and efficiency is striking in every conversation.
Better concentration
Unwanted calls are distracting and reduce your team's focus, while the call filter ensures your colleagues stay focused on delivering excellent service instead of handling nuisance calls.
Better service
Fewer interruptions and lower time pressure allow your colleagues to consistently give each caller the attention they deserve, raising the quality of your customer service.
How the call filter works
The call filter sits between your CallFactory number and your team, so the system checks every incoming call number against your filter rules before the call is forwarded. Blocked numbers hear a busy tone or message and don’t reach your team, while in whitelist mode you can ensure only numbers on your approved list come through.
You manage the filter from the CallFactory dashboard, where you can add or remove numbers individually or block entire number ranges when you get nuisance calls from a pattern of numbers. Changes take effect immediately without waiting or needing a support ticket.
Block anonymous and hidden callers
Some unwanted callers hide their number, making it harder to block them directly, but not impossible. Share the date and time of the call with our support team, and we’ll trace the anonymous number for you so we can add it to your filter.
Once identified, we add it to your call filter so these calls no longer get through. If your business has no reason to receive anonymous calls, you can choose to block all calls with a hidden number, which is especially useful for businesses that deal exclusively with known customers or partners.
Reroute instead of block
Blocking isn’t always the right answer, because sometimes you want a specific caller to reach a different person or department. The call filter can reroute individual numbers to a separate destination — a dedicated account manager, a complaints line, or a voicemail box — so nuisance callers get special attention, VIP clients bypass the queue, or internal numbers go straight to a specific team member.
You set the routing per number, and the caller notices no difference between a blocked and rerouted number.
Temporary filters for specific situations
Not every filter needs to be permanent, because when you’re running a campaign and get a flood of irrelevant calls, you can activate a temporary filter for the duration. Once the campaign ends, you remove the filter and your setup goes back to normal, so you don’t need to make permanent changes.
Temporary filters are also useful during office relocations, holiday periods, or situations where your call patterns temporarily change, because you stay in control without adjusting your base settings.
Included free with every number
The call filter is included free with every Irish telephone number or International telephone number, so you don’t pay any extra cost for this security feature.
Learn more about other features
Discover more features designed to enhance your business communications.
API integrations
Tell us what you need, we build the endpoints. Our private API lets you integrate CallFactory telephony into your own software — no generic library, no guesswork, no wasted development time.
Calendar-based call routing
Automatically route calls based on your schedule. Office hours, rotating shifts, holidays, and on-call rosters — calls always reach the right person at the right time.
Call forwarding
Forward incoming calls to any landline, mobile, or team. Set rules based on time and availability — manage everything from your dashboard.
Call filter FAQ
Get clear answers about the call filter and how it works for your business.
Yes. Add the number to your block list through the dashboard and it takes effect immediately, so the caller hears a busy tone or message and doesn’t reach your team.
Yes. When you get nuisance calls from a pattern of numbers, you can block an entire number range instead of adding each number individually.
Share the date and time of the call with our support team so we can trace the anonymous number for you and add it to your filter. You can also choose to block all anonymous calls completely when your business has no reason to receive them.
Yes. In whitelist mode, only numbers on your approved list get through, while all other callers are blocked. This is useful for businesses that work exclusively with known customers or partners.
Yes. Instead of blocking, you can reroute specific numbers to a different destination — a separate team member, a complaints line, or a voicemail box — so the caller notices no difference.
No, the call filter only works on incoming calls to your CallFactory number.
Yes. You can add and remove filters at any time, which is useful during campaigns, office relocations, or holiday periods when your call patterns temporarily change.
No, the call filter is free with every CallFactory number.
