Here is what I added to the welcome message, see if it works for you.
Change Voicemail Pin number
Press 7
Enter new pin code
Press #
Verify message
Press *
**** Once you change your pin number you will also need to
change it for the 3cx Myphone app so that it doesn't lock you out.
Greeting Name
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Press "5" to change your greeting name (not your message, just your name) Press "0" when ready to say your greeting name"
Press "#" when completed
Press "0" to save the new greeting name
Voicemail Message
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Press "8" to change your greeting name (not your message, just your name) Press "0" when ready to say your greeting name"
Press "#" when completed
Press "0" to save the new greeting name