If the user has enabled voicemail and they want to check the voicemail in the dialer itself then they can follow these steps.
Step 1: Sign in to your dialer https://dialer.callhippo.com/
Step 2: Click on the three horizontal dots on the top left corner.
Step 3: Click on the All Calls/Inbox.
Step 4: Then select the number on which voicemail is received.
Step 5: You can play a voicemail from here.