In android phones running Froyo 2.2 version of android operating system can use the feature to end calls by pressing the power button. This feature works perfectly on nexus one as we have tested the same, but it should work on other android phones which are running on android version 2.2 and let us know if it worked or not.
Follow the procedure to enable the option to end calls with power button
1. Go to android phone settings by pressing the edit key on your android phone as shown in the image below.
2. Under settings tap accessibility as shown in the image below
Now tap to check the option which says Power button end calls as shown in the image below.