Before downloading you have to do the following steps:
1.The first time you use the softphone you will se the connection settings screen. You can do it later if you click on the bottom button and then you click on "connection" as you can see in rigth image.
You need to fill the appropiate gaps:
a. Extension----> your number extension
b. ID -----> identification user or number given by your voip provider (ussually it is the same as your extension)
c. Password ----> Password given by your voip provider
d . When you see "My Location" you need to write the IP or doamin of your voip provider. I prefer to check "I am out of the office" because I use a laptop everywhere.
Anything else it is not neccesary. Just if our provider gives us special instruccions.
3. Click "OK" and we have just finished.
4. (Optional)
You could see a button called "Advanced Settings". You can click on it to configure advanced options.
for example:
PBX Voicemail: You can configure here the voieimail that your voip provider may has given to you.
Codecs: You can choose the codec you want to use in first place.