Enable Clerk Voicemail

Voicemail will ask the user to leave a message, and will post a link to the audio recording and a speech-to-text transcription to Slack.
This feature is only available on the API plan. Once connected you will receive both the voice recording and the transcript right on your default Clerk Slack channel. Setting up Clerk voicemail on your Twilio account is pretty straightforward and involves the following steps:

Creating a Twilio Studio

Navigate to Twilio Studio and create a new studio flow.
Create a new studio flow
Add a voicemail greeting by connecting a Say/Play widget to your Incoming Call Trigger. Once connected you can either upload your own voicemail greeting or type in a digital voice text.
Add a Record Voicemail Widget and connect it to your Say/Play widget.
Add a Transcription Callback URL: https://api.clerk.chat/prod/twilio/voicemail/transcript
Click Save and then Publish.
Customize Studio Flow

Attaching Twilio Studio Flow To Your Phone Number

Navigate to your Active Numbers and select the phone number.
Under the A Call Comes In section, select Studio Flow and then select the studio flow you have created in the previous step. In our example we select voicemail.clerk.chat. Click Save.
Select Studio Flow
Your Voicemail and Transcription are now activated and will appear in your Slack as soon as a call comes in.