---
title: Updates to Call Control Webhooks
canonical: https://telnyx.com/release-notes/updating-call-control-webhooks
---
# Updates to Call Control Webhooks

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

# Updates to Call Control Webhooks

### 27, May 2021

We're always working to make your experience better. Part of this work involves unifying your developer experience between our Elastic [SIP Trunking](https://telnyx.com/products/sip-trunks) and Call Control products.

As part of this unification, we're making a change to webhooks associated with calls that use our Voice API, Call Control.

## What is changing?

Webhooks associated with calls that use Call Control contain a `call_control_id` field, which associates a unique identifier with the call and its corresponding API activity. They also contain a `call_leg_id` field, which associates a separate unique identifier with the call and its SIP activity.

This call\_control\_id field currently takes the form `"call_control_id": "v2:ujuK_2BDm1w5jJLz--bMGbZ-TuMfo86BmKCDk0KllxoYLrxh1HGf3g"`.

After this change takes effect, the `call_control_id` field will contain the same data as the `call_leg_id` field in any given webhook, and will take this form:

`"call_control_id": "d14dbcee-880b-11eb-8204-02420a0f7568"`.

## How can I ensure my communications are unaffected by this change?

If your Voice API application parses the `call_control_id` field from Call Control webhooks, you may need to update your application to accommodate the new format of data contained in this field.

## When is this change happening?

This change is being rolled out in phases. If your account is set to be part of a migration phase, you'll receive a notification from your account manager, or at the email address associated with your account.

## Who can I contact for more information?

As always — our technical team is available 24/7 via [live chat in our Portal](https://portal.telnyx.com/), or [Slack](https://joinslack.telnyx.com/) if you have any questions.

[Start building](https://telnyx.com/sign-up)

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