Alternatively, you could try disabling call forwarding, though your particular carrier or phone model may not allow it:
From a Home screen, tap the Phone app . Tap Voicemail .Tap the desired message then tap the Trashcan icon . Tap Deleted Messages.Tap Clear All (upper-right) then from the prompt.Tap Clear All to confirm. Select the Voicemail tab. Note: Alternatively, from the phone app, select the Keypad tab > select and hold the 1 key > if prompted, enter your voicemail password > follow the prompts to listen to your messages. Select the Voicemail tab, then select Set Up Now. Note: Alternatively, you can set up voicemail by selecting the Phone app then pressing and holding the 1 key. If prompted, enter your voicemail password, then follow the prompts to set up your voicemail.

5. Your voicemail will walk you through the setup process, including recording your personal greeting (the message that plays when you receive a call that goes to voicemail) and possibly your voice signature (your name, spoken by you into the recording).
The telephone systems have the feature named as Voicemail. VoIP is the best example of it. When a receiver is unable to pick up the phone, then the caller can leave the voice message on the receiver’s phone. In older telephonic machines, such messages were stored as a voice message directly, and the receiver can hear them later. In modern telephone systems, such info is being stored on the server of the service provider in the user’s mailbox. It is similar to email in which the messages are saved in the form of audio instead of text.