Help / Customer FAQ
Block caller IDs with Filter Phone Groups
Build a block-list of numbers and divert matching callers on a DID.
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.
1. Build a group
Go to Server detail → Inbound → Filter Phone Groups and click New group (ID is 2–20 chars, letters/digits/underscore). Open it and add numbers two ways:
Paste a list — one per line or comma-separated. Formatting is cleaned automatically (we strip spaces, dashes and parentheses to digits and keep a leading +), and duplicates are dropped.
Upload a CSV/TXT file (one number per line).
From the same screen you can download the group as CSV, empty it, or remove individual numbers. The toolbar also has Look up a number (find which groups contain it, and remove it from all) and Download all (every number across every group).
2. Attach it to a DID
Open a DID (Inbound → DIDs) and the Filters tab. Set Filter inbound calls to Block-list, tick one or more groups (each shows its number count), and optionally enable also match the caller's area code. Then choose what happens on a match — Hang up, or send to an in-group, call menu, or extension.
Notes
Matching is on the inbound caller ID, so store numbers the way your carrier presents them (digits, usually with the country code).
One group can be attached to many DIDs; changes to the group apply everywhere it's used.
This is separate from Repeat callers (which matches your recent call history) — use Filter Phone Groups for a fixed block-list.
Tags: blocklist, inbound, dids, filter phone group