[asterisk-users] Cancel a ringing SIP call when the other party disconnect

[Ruddy Gbaguidi]

Hi,
Here is my scenario.
I have a SIP call between two SIP endpoints. A calls B.
During the ringing, B disconnects (network cable is unplugged).

But A continue ringing forever (until the dial timeout) even if asterisk 
detects that B is disconnected with the qualify.

Is there any setup or asterisk configuration I need to enable to have A 
close its call ?

Note: when A is already talking with B, the call is hanged up on rtp 
timeout. But not during the Ringing phase.

Thanks