Step 1:  The 1st Step is to download softphone exe file. You can download the exe file from here:

Step 2: Now you will notice that the exe file. When you click over the exe file, the following pop-up opens up. Please do click on "yes" button.

Step 3: Once you click on the "YES" button, the following window will open up. Please click on "NEXT" button.

Step 4: When you click on Next button, the below screen will appear. Please accept the terms as shown with an arrow on the picture. 

Step 5: The next step is to do the following : 

Step 6: In this step create a desktop Icon. The action to be taken is shown in the image. 

Step 7: There should be a soft phone downloaded on the desktop with the following image: 

Step 8:  Now bring the mouse over the Softphone and "Right Click" When you right click the following window will open up. 

Step 9: Now you click on the "SIP ACCOUNT Settings"

Step 10:  When you click on SIP Account Settings, the below window opens up. In this window click on the "ADD" button. 

Step 11:  By now you will notice that we have sent you certain details like Display Name, User Name, Password, Authorisation user name, Domain. Its time to feed these details. Once you click on the Add Button, the folksinging Window opens up. Feed the details in this window. After you have feeded the details , Click on "Apply" and then "OK"

Step 12: So now the below window will open. Click on the "close" button as shown on the below image. 

Step 13: Once you have clicked on the "close" button, it should show that the softphone is in  ready as shown in the below image. 

Step 14: This is the almost ending. Now you click on the "Auto Answer" button. Auto answer should be enabled. Som 

Step 15: After you have clicked on the Auto Answer, the softphone should show "Auto Answer" enabled. 

refer to the below image. 

Step 16: This is the last step. Click on the Hide system tray, as shown on the below image.