The following is a list of 3rd party Softphone products and download sites:
Softphone Setup 1 X-lite – Windows, Linux, MacOSX
Softphone Setup 2 Zoiper – Windows, Linux, MacOSX
Softphone Setup 3 Linphone – Windows, Linux, MacOSX, Android, iPhone, iPod


Sample Installation and configurations for X-lite Softphone:
Download the latest version of X-lite to your computer from above link. Double click and follow the installation instructions

1. Once installation is done, wait for the application to load. Locate the program icon on your Task Bar menu.  Or in an open window.

2. To setup your SIP account click on the Softphone and Account Settings or click on the Account settings in blue.

3. Account Settings menu, under User Details insert User ID and Password from your account details the Domain is click OK and the Softphone will be ready to use.