It is normally loaded by Salesforce into an iFrame on the user's Salesforce web pages.
Users will need to be configured to use a Call Center definition based on the "Mitel Cloud Adapter".
The call center detail's "CTI Adapter URL" will need to be set to the URL of this page.
Mitel Salesforce.com Softphone Webpage
This web page requires a web browser with HTML5 support.
You either need to log into Salesforce using a more current version of this browser or a different browser or enable certain disabled HTML5 features such as Local Storage.
If you are running Internet Explorer 9, make sure that you are not running in compatibility mode.