You can choose to leave a voicemail message for a person directly. You don’t have to talk to the person first.

Dial *55 followed by the extension of the person.

The *55 feature code is for Direct Voicemail Transfer and works on an active call.

An internal caller can reach a person's voicemail directly by logging into the Voice Portal, compose a message and send it to the recipients mailbox. For an external caller, it depends on the voicemail settings of the called party.

If the person doesn’t have a voicemail account, you reach their phone, not their voicemail.