Spam calls cost twice: robocalls waste your team’s day, and, on the flip side, your own legitimate calls can get labelled “spam likely” on customers’ phones. Cannon VoIP works both sides of that problem.
Call screening
Screened callers state their name and reason, and your phone rings as soon as they start speaking, with their words appearing live on your app and browser phone. Tap Accept to connect or Voicemail; doing nothing also ends in voicemail. A caller who says nothing goes to voicemail without ringing anyone. Desk phones ring for screened calls too and play the caller’s words: press 1 to accept or 2 for voicemail, then press 1 to pick up if you change your mind. Callers hear your hold music while you decide, and saved contacts ring straight through.
Caller verification for flagged calls
Callers the network has flagged can be asked four spoken questions: their name, company, reason, and how they got your number. Their answers show on screen when your phone rings, and a caller who answers all four is trusted at your company for 30 days.
AI screening rules
Describe the calls you never want, or tick reasons like sales, debt collectors, surveys, recorded messages or likely scams. A caller who fails your rules goes to voicemail without your phone ringing, and the call log says which rule did it and why. If the check is unsure, your phone rings.
Contacts your way
Set any contact to always be screened, never be screened, or go straight to voicemail. You can also edit the question screened callers are asked, per person and for the company.
Spam handling per number
Choose for each phone number whether flagged calls get a warning, are screened, are turned away, or are ignored. Flagged calls that ring show “Possible spam” at the start of the name. Spam means a failed identity check, not just an unknown caller.
Listings decided by people
Numbers reported by several unrelated customers are reviewed by a person, and every network-wide listing is decided by a person with a written reason. Blocked callers hear where to send an appeal, and an appeal pauses the block right away.
Blocking on your terms
Dial *97 to block your last caller. Block a number just for you or for the whole company; personal block lists stay private. Blocks can expire after a set number of days, and block lists import and export as spreadsheets.
Caller timeout for repeat callers
A number that keeps calling the same person or group gets paused. By default, the 5th call within 5 minutes starts a one-hour timeout, and you can adjust the limits or exempt any number.
Bad numbers refused automatically
Calls showing invalid or unassigned numbers are refused automatically, and so are calls pretending to be one of your receive-only numbers.
911 callbacks always ring
For 30 minutes after someone at your company dials 911, all blocks and filters step aside, so a callback from dispatch always rings through.
The other half of spam protection is outbound. Every outbound Cannon VoIP call is signed with STIR/SHAKEN, the cryptographic signature receiving carriers use to decide whether your call is trusted, ranked, or flagged. Calls get the highest trust rating (full attestation) when the number truly belongs to the caller, and every caller ID is checked against numbers you actually own.
For the deeper story on attestation and why carriers label calls at all, read our plain-English guide to STIR/SHAKEN.
