You can configure the no reply forward waiting time via web or Phone UI.  
•  Configure no reply forward time via web 
 
•  Configure no reply time via Phone UI 
 
10.14.5 Call Forward Synchronization for Server-side Configuration 
Call forward synchronization feature provides the capability to synchronize the status of the call forward 
features between the IP phone and the server. 
If the call forward is activated in phone mode, the forward status changing locally will be synchronized to 
registered default accounts on the server. 
If the call forward is activated in custom mode, the forward status changing locally will be synchronized to the 
specific accounts on the server. But if the forward status of the specific account is changed on the server, the 
forward status locally will be changed. 
The IP phone support 2 methods to synchronize the status of the call forward between the IP phone and the 
server.