I'm trying to integrate asterisk on CRM. Downloaded the Phonebridge adapter and got 'UnknownHostException' while installing the adapter. I don't understand what this error means. I don't understand the adapter is installed or not.

When I try to dial the number from lead, which I created for a test, there appear popup windows with text, 'CONNECTING' but no traffic comes to PBX server. 

What can I check?