SIP

In this tutorial we will show how to implement "click to call" functionality in a web page using PHP-SIP class, free opensips.org SIP registrar service and Twinkle softphone.

The same principle can be used with any RFC compliant SIP service or

As most of our products are web based applications developed in PHP, we had to find a way to interact with SIP services from within a PHP code.

After evaluating few different options, like calling sipsak tool with exec PHP function