Dialing Permissions — Controlling What Each Extension Can Call
Every extension carries its own dialing permissions — independent switches for internal, external, international, and emergency calling, plus feature-code use and supervisor monitoring. Defaults are sensible (external on, international off); review them whenever an extension serves a public or unsupervised space.
The permission set
Permission | Default | Notes |
|---|---|---|
Internal dialing | On | Extension-to-extension calls |
External dialing | On | Off for lobby/waiting-room phones |
International dialing | Off | Enable per-extension only when needed — toll-fraud protection |
Emergency dialing | On | See warning below |
Feature-code dialing | On | Star codes (paging, caller-ID override) |
Whisper / Listen / Barge | Off | Supervisor monitoring rights — enable for managers only |
International calling and toll fraud
Leaving international dialing off by default is your cheapest security control. Compromised credentials are typically monetized by pumping calls to premium international destinations — an extension that can't dial internationally caps that exposure. Enable it for the specific users who need it, not account-wide.
Restricted phones that can still reach help
For a phone that should only call a few internal numbers (a waiting-room courtesy phone), disable external dialing and use the internal-override list to whitelist the allowed extensions.
Warning: never disable emergency dialing on a phone people might reach for in a crisis. If you must (fax lines, paging boxes), document it, and confirm the space has an obvious alternative for 911. Emergency calls also depend on a correct E911 location.
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Last reviewed August 6, 2026. Still stuck? Contact Signal Support from your portal — include what you expected, what happened instead, and one example phone number or extension.