Put some thought into your message before you hit “record.” It takes very little time to write a script for yourself to read as you record your greeting. Reading off a script eliminates unnecessary pauses, “ums” and “ahs.”
"I'm sorry�" followed by the mailbox owner's name (as recorded by the owner or administrator), then "�is currently on the phone" then the owner's personal greeting, and then the fixed system prompt, "Begin speaking after the tone, then hang-up when you are finished or press any key for further options."

You can also set the voicemail greeting for Call Queues and Ring Groups in 8x8 Admin Console by following the same steps - just edit the relevant Ring Group or Call Queue and follow from step 5.
Don’t leave customers and colleagues on edge. If you say you’re going to call them back, follow up. If you tend to fall behind in this area, encourage them to email you or reach out in another way. Better yet, learn how to forward voicemail to email so you can access the message anywhere.