### Answer Yes, you can increase the ring duration in Retell AI. The

ring_duration_ms

setting controls how long the call rings before being considered unanswered. [(1) ]() You can configure this via the Update Voice Agent API:

javascript
const agentResponse = await client.agent.update('16b980523634a6dc504898cda492e939', {
  ring_duration_ms: 30000,
}) ;

The default is 30 seconds (30000 ms) , but you can increase it to allow more time for the transfer target or recipient to answer—for example, 50 seconds would be 50000 ms. [(2) ]() For inbound calls specifically, you can also increase the ring duration by using the inbound webhook and waiting on your server before sending back the response. [(3) ]()

​ To learn more, see the sources I considered: [[1] Update Voice Agent](https://docs.retellai.com/api-references/update-agent) [[2] Warm call transfer issue.](https://discord.com/channels/1186424376300679209/1468937717097431215) [[3] Discord message from @elders7130 on 2025-08-13](https://discord.com/channels/1186424376300679209/1186462578310910112/1405189559142191176) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.

We need more that 90 seconds, is it possible to achieve? @AI Evy

### Answer Unfortunately, the

ring_duration_ms

parameter has a maximum allowed value of 90,000 ms (90 seconds) . [(1) ]() The documentation states: "Default to 30000 (30 s) . Valid range is [5000, 90000]." This means 90 seconds is the hard upper limit for ring duration in Retell AI, and you cannot configure it to ring longer than that through this setting. For use cases requiring longer wait times, you might explore alternative approaches such as handling the timing logic on your server side via webhooks before returning the response, though this would depend on your specific implementation needs.

​ To learn more, see the sources I considered: [[1] Update Voice Agent](https://docs.retellai.com/api-references/update-agent) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.