[cisco-voip] FXO Disconnect problem

[new look]

During the deployment of one of our solutions I faced the below described problem:
 
As shown in the attached figure, this is the actual connection between the devices.
 
1) We configured the router dial peers and (phone-2) can call (phone-1) successfully by calling “222”.
2) Then after I get the tone from the router FXO port I press “111” and phone1 starts to ring.
3) If phone-1 goes off-hock the call is established successfully.
4) The problem is if phone-1 is still ON-hock and ringing and phone-2 goes ON-Hock. phone-1 remains ringing although ph-2 is on-hock.In order to stop this problem what should we do.


 
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