PHP-SIP class released

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 or sending UDP datagrams to OpenSIPs management interface we found none of them is exactly what we were looking for.

Therefore we decided to implement a simple SIP user agent (both UAC and UAS) in PHP language.

In the next few months we will publish detailed tutorials how PHP-SIP can be used to implement "Click to Call" or Instant Messaging with SIP SIMPLE.

The code is licensed under the terms of GPL v2 license and can be found at code.google.com/p/php-sip/