Open URL on event will allow you to either open a webpage or some application on a specific event. The setting is located in Settings -> Automation -> Event Rules.
The following OpenURL on event parameters are currently available:
This will open the website www.example.com followed by the Caller ID number e.g. www.example.com/+1234567
This will open the website www.example.com followed by the Caller ID number, followed by the Caller ID name e.g. www.example.com/+1234567/Smith