> For the complete documentation index, see [llms.txt](https://docs.inova.us/v1/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.inova.us/v1/twilio-in-browser-call-plugin/troubleshooting.md).

# Troubleshooting

## Troubleshooting

### Error 31202 — authentication failed

The access token was signed with the wrong credentials. Twilio Voice access tokens must be signed with an **API Key SID (`SK…`) and its Secret**, **not** your Account Auth Token. Re-create an API key ([Getting Started › Create an API key](/v1/twilio-in-browser-call-plugin/getting-started.md)) and set `TWILIO_API_KEY` / `TWILIO_API_SECRET` in your token function.

### No audio / microphone not working

* The browser must grant microphone permission. Check the **Mic access status** state (`granted`, `denied`, `prompt`) and prompt the user to allow the mic.
* Calls require HTTPS. Make sure your app is served over `https://`.
* See Audio Device Selection if the wrong microphone or speaker is being used.

### Calls drop after \~1 hour / token expired

Access tokens have a limited lifetime (default 3600s). Listen for the **Token Expiring** event and run the **Update token** action (or refresh the token state for subaccounts) to keep the session alive. See [Subaccounts › Refreshing Client Tokens](/v1/twilio-in-browser-call-plugin/subaccounts.md).

### Incoming calls don't ring

* The device must be **registered**, and the token's incoming grant must be enabled.
* Your Twilio number must route to the client identity that matches the **Agent Identifier** (see [Receiving Calls](/v1/twilio-in-browser-call-plugin/receiving-calls.md)).
* If **Auto Reject** is enabled, calls are rejected while the user is on another call — the **Auto Rejected Call** event fires instead.

### Outgoing caller ID is wrong

Set **Caller Number** on the Start Call action and make sure your Twilio voice function uses `event.appCallerId` (not `context.CALLER_ID`) when you use multiple numbers. See [Getting Started](/v1/twilio-in-browser-call-plugin/getting-started.md).