Block caller IDs with Filter Phone Groups

A Filter Phone Group is a named list of caller-ID numbers. Point a DID at one or more groups and any matching caller is diverted before reaching your queue — useful for known bad actors, repeat nuisance callers, or do-not-engage numbers.

Build a group

1. Open your server and go to Inbounds → Filter Phone Groups, then click New group.
2. Give it an ID — 2–20 characters: letters, digits, and underscores. It can’t be changed later.
3. Open the group and add numbers one of two ways: paste a list (one per line or comma-separated — formatting is cleaned automatically: spaces, dashes, and parentheses are stripped down to digits, and duplicates are dropped), or click Upload CSV / TXT.

From the group screen you can also Download the group as CSV, Empty it, or remove individual numbers. The toolbar adds Look up a number (find which groups contain a number, and remove it from all of them at once) and Download all (every number across every group).

Attach it to a DID

1. Go to Inbounds → DIDs and click a DID to open its edit sheet, then pick the Filters tab.
2. Set Filter inbound calls to Block-list — filter phone group(s).
3. Tick one or more groups (each shows how many numbers it contains), and optionally enable Also match the caller’s area code.
4. Choose When a match is found: Hang up (play goodbye, then disconnect), or send the caller to an in-group, call menu, or extension.
5. Click Save.

Good to know

• Matching is on the inbound caller ID, so store numbers the way your carrier presents them — digits, usually with the country code. A number stored with a leading + won’t match a caller ID that arrives without it.
• One group can be attached to many DIDs; changes to the group apply everywhere it’s used.
• Deleting a group (owner accounts only) doesn’t detach it from DIDs — remove it from each DID’s Filters tab first, or that DID quietly stops filtering.
• This is separate from Repeat callers, which matches your recent call history — use Filter Phone Groups for a fixed block-list.