Record your voicemail greeting on a UCM
Change what callers hear when you can't answer.

Record it from your own phone.
Steps
- Dial *97 and enter your voicemail PIN.
- Choose mailbox options from the menu.
- Pick your unavailable or busy greeting and follow the prompts to record it.
- Listen back and save.
Tip: *97 is the default code. Check Call Features → Feature Codes if it doesn't work.