In the 2nd Generation screens of Safire there is an option of "CALL FORWARD TIME" where the default value is equal to zero; that means that the call will be forwarded directly to the mobile at the same time that it rings on the screen.
Next we explain some of the configuration parameters:
1 - It is the maximum time of the incoming call. If the call is not answered before 50 seconds, then the incoming call is terminated. This time is configurable from 30s to 60s.
2 - Maximum time for live display. This is the maximum time that a live display reproduction of the screen can last and this time is configurable, from 10s to 60s.
3 - Call forwarding time. It refers to the time limit of an incoming call only on the screen; when the defined time is reached, it will be diverted to the mobile in the form of a PUSH notification, but at the same time it will continue to ring on the screen. The time is configurable from 0s to 20s.
Therefore, in field Nº 3 if we change the default value to zero and for example we configure 10s as it was done in this FAQ, the screen will ring for 50 seconds and if in the first 10 seconds there is no answer on the screen, the mobile will also start ringing.