While developing a PHP server application that should handle some of these events, I came across the problem that there is no data in the PHP array $_POST although the script is called by the Polycom phone correctly.

After doing some investigation I found out that the data is not sent (for whatever reason) as “normal” POST key value pair, but just as raw POST data. Obviously PHP is therefore not able to add this raw POST data to the array $_POST.

Here is the way you can get the raw POST data anyway:

// Make sure that there really is some raw POST data available
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
	// Now we can read the raw POST data from PHP standard input
	$rawPostData = trim(file_get_contents('php://input'));
}

As a result you have the XML data that was sent by the Polycom phone in the variable $rawPostData.

Did you also have problems receiving Polycom event data?