SMSsync uses the HTTP and HTTPS protocols for communication.
To start the SMSsync Gateway, you'll need to specify a Sync URL. This URL is where all incoming SMS will be transmitted to. Remember to enter the full URL including the filename. A typical example will be http://somedomain.com/index.php
For security you can specify a secret key to be sent to the Sync URL. If the secret key doesn't match on the server, the Sync URL can ignore the transmission.