You can make VOIP Calls almost instantly by getting free software (Free SIP Softphones). You can choose what fits more to your special needs depending the use purposes.
To make VOIP Calls with good quality we suggest you to use Zoiper. It is predefined for nrgvoip.com settings and easy to use. So our VOIP Services are Zoiper Ready!

Get it here:

There are a lot of other Free SIP Softphone software that they are very good to use. You can also use Linphone. Get it here.
After downloading and installing in your device go to our nrgvoip.com Support Center to see the settings and use it to make VOIP Calls.