---
title: Voice API - Updates to how calls are identified
canonical: https://telnyx.com/release-notes/voice-api-call-control-id-format
---
# Voice API - Updates to how calls are identified

[Release notes](https://telnyx.com/release-notes)

# Updates to how Voice API calls are identified

### 29, Jun 2022

We're updating the format of the `call_control_id` parameter that's associated with Voice API calls.

Phone calls made or answered using our Voice API are identified using the `call_control_id` parameter returned by our API.

Until now, this parameter has taken the format of a UUID, for example `e0209774-f131-11ec-aadf-02420a0de568`. After this change has taken effect, the `call_control_id` parameter will have a new format, starting with `v3:` followed by a string of 54 randomly-generated alphanumeric characters, for example `v3:hhMGgm44EjgAss3mLDeF6W2er2HpHcYFp7mMR8eLwqdzYISO5KY6Dg`.

This change will take effect on **Tuesday, August 2, 2022, at 17:00 UTC**.

If your Voice API applications use the `call_control_id` parameter to identify and manage calls, you should ensure that they can parse both formats of this parameter to avoid application errors.

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