[cisco-voip] How to reduce call disconnect time in UCM

[shary shary]

hi folks,
One of my customer facing problem. When they make calls to PSTN number and after talking caller disconnects the call first, IP Phone from where person made a call remain connected around 20 -25 seconds with some ring tones and then disconnect. They want to reduce this time to minimum. I am unable to find the way to set this. Any help would be appreciated.
 
Thanks in advance,
 
Regards. 		 	   		  
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