Test numbers: checking Caller ID, audio and DTMF

After setting up a device, use these built-in test numbers to confirm everything works:

• 1-555-555-0911 — verifies that your Caller ID is being sent correctly. This is worth checking, because national rates depend on presenting the right Caller ID.
• 4443 — an echo/audio test to check sound quality in both directions (useful for diagnosing one-way audio).
• 4747 — a DTMF test to confirm that key presses (touch-tones) are being transmitted, which matters for navigating IVRs and phone menus.

If the Caller ID test shows a withheld or wrong number, check that "hide Caller ID" is disabled on your device and that your chosen outbound number is set correctly in your account.