Hi Amit,
Glad you've resolved your issue.
I'm not familiar with the Audiocodes gateway, however I expect it will have settings and monitoring on the sessions it's running to determine if they are still active.
It may be the gateway that has disconnected the call or it could be something else.
Recommend you get the gateway settings checked, if you know that reverting the timeout to 10 seconds will bring back your issue then in this menu 5 seconds seems a sufficient time out, but if you need longer for another menu the underlying problem still exists.
BR
Karl