If you want to automatically reject calls from specific phone numbers, you can do this easily on the Yealink Phone. Here are the steps:
1. Go to the Menu (Each model may be different see the guide for your model)
2. Choose Directory
3. Select Black List
4. Clci kon "Add"
5. Enter the contact info and the numbers you would like to block. (Office, Mobile, other)
Now when someone calls from that number your Yealink Phone will not ring.