How do you put a panasonic KX-T6730 on voicemail instantly if you need to leave the office early?

This phone doesn't have voicemail! You need to speak to your IT guy, it is a system feature to the PBX unit, not the phones themselves. Here is your manual. You can set an Absent Message - Page 30.

https://manualsbrain.com/en/manuals/990969/

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Call the phone company to fix the problem.

We regret to inform you the KX-TC1881 does not have an answering machine built in. You may have a separate device or voicemail service you will want to investigate.

The KX-T7453 isn't a voicemail system. Please refer to the documentation for whatever voicemail system you have connected.

What's answering the calls, is it the Panasonic system or the central office? When you figure that out, and it's locally, then post back with the model number of your phone sytsem cabinet and whether you dial 107 or 115 ot get into voice mail, or the message is left in the central office.

Carl

Find the password to mailbox 999 or call a Panasonic dealer.

Carl

The answer for both of you is the System Administrator's mailbox. It lets you addl, delete and edit mailboxes and reset passwords.

When your system was installed, you should have been given instructions and passwords for both the Message Manager and System Manager's mailboxes. The access to those boxes is similar and I will not give out that sequence in a public forum, but you should be able to find it in the manual or via email to me...I'll show up on the web somewhere.

Carl