PHP class file to send sms through com port in Windows

We currently require a PHP class that can be included in our php script to send and receive sms by using GSM mobile phone connected to a Windows server, we are not interested in remote sms gateway services. Our php version is PHP 5.3.13 We have access to install php extensions (.dll) There are various opensource class available and this should not take more than two days. The Phone being used is Nokia N73 (S60) connected via USB cable. These is what we expect as deliverables. 1) A front end that shows the inbox of the mobile phone. 2) A form with two fields to enter the number and message. 3) The php script that we can include into our script.