passing variables from PHP to Perl script

I'm trying to integrate an Internet Telephony service for a client. I have a number of variables I need to dump into the clients database and then to pass to the Internet Telephony service via a Perl script they have provided for me that will reside on the client's server. Can I somehow pass them "behind the scenes" or should I use a redirect. There is info I need to keep away from the end user, mainly the phone number.