How to send internal calls to voicemail and still recieve incoming calls from the outside

[Zero6]

Hi All,

At a client I have a server edition 11.1.24 and the clients wants that internal calls paly a message between 12pm and 1 pm that the office is cosed for the other collgues, but still wants to recieve incoming calls from the outside

I have programmed a message with voicemail pro, but it plays for the outside
Does anyone have an idea how to set this up the way they want it?

Thank you in advance