Missed calls when busy. Yeastar S300

We use Yealink T19P with turned off Call Waiting and Yeastar S300.

1. But when user1 calls user2 and user2 is busy user2 will see missed call from user1. How can i turn off that option?

2. User1 have linkus and 2 registrations in extension. S300 enabled option "All Busy Mode for SIP Forking". Linkus turned off on mobile (logout), so he has 1 active registration. Call Waiting off. When user1 is busy and user2 call him, user2 can listetn standart call tone, not busy tone. And user1 get missed call later, after his call. what's wrong?


S300 firmware:


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