SIP

In our work we very often use various VoIP and Network diagnostic tools. All of the natively work and are easily available on Linux platform. Unfortunately when investigating SIP and/or network related problem on customer's network we are often limited

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