On busy
If Call forwarding on busy is configured on the phone, another incoming call during an active call is not signalled. The call is forwarded to the entered call forwarding destination. Even if call waiting (with or without call waiting tone) is configured on the phone, another incoming call during an active call is not signalled.
Configuration
With the Configuration Manager:
• Telephony > Call forwarding > On busy
You will find more information on this subject in the Call forwarding topic.Or directly on the phone:
• Settings > Telephony > Call forwarding > On busy
You will find more information on this subject in the Telephony topic.Or using provisioning:
• You will find more information on this subject in the Auerswald DokuWiki