---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/80902#article
headline: "80902: No Active Session"
url: https://www.twilio.com/docs/api/errors/80902
inLanguage: en
dateModified: 2026-06-08T12:04:59.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 80902: No Active Session

Log Level: ERROR

## Description

This error occurs when Proxy receives a call to a Proxy Number from a caller who is not a Participant in an open Session. Proxy Sessions map two Participants for a temporary conversation, so a call that arrives after a Session is closed, expired, or never created is treated as out-of-session traffic.

### Possible causes

* The caller's phone number was never added to the Session as a Participant `identifier`.
* There is no `open` Session for the caller because the Session was closed, failed, or expired based on `ttl` or `dateExpiry`.
* The caller dialed a different masked number than the `proxyIdentifier` assigned to that Participant. Proxy expects the participant to call the assigned Proxy Number to reach the other party.
* The Service was not configured with `outOfSessionCallbackUrl` to handle calls that reach a closed or non-existent Session.

### Possible solutions

* Create the Session before either party places the call. Add the caller and the other party as Participants in that Session.
* Verify that the caller's real phone number matches the Participant `identifier` stored in the intended Session and that the caller is dialing the assigned `proxyIdentifier`.
* Review the Session status and expiration settings. Increase the Service `defaultTtl` or set the Session `ttl` or `dateExpiry` so the Session stays open for the full lifetime of the conversation.
* Configure `outOfSessionCallbackUrl` if you need to handle calls that arrive after a Session ends or before one exists. Return valid TwiML to play a message or redirect the call, or return auto-create Session JSON to create the Session and Participants when appropriate.

#### Additional resources

* [Proxy Session resource](/docs/proxy/api/session)
* [Proxy Participant resource](/docs/proxy/api/participant)
* [Out-of-Session Callback Response Guide](/docs/proxy/out-session-callback-response-guide)