Yealink Voicemail Configuration on Grandstream UCM6102

[adam.comws]

Good day,

I would like to set up Voicemail on my Yealink T41P phone using a time condition rule.

When the store closes at 6pm, I would like incoming calls to only ring on extension 1003 and that extension must take a voicemail message.

Also, how does the person at extension 1003 retrieve said message the following morning?

We are currently making use of a Grandstream UCM6102 PBX with the following Yealink phones:

T48G
T41P
T23G
W52P

We do not want voicemail for the other extensions at all.