When you login to LeadDesk and try start calling, if you get this error - try the following troubleshooting steps:
As an agent:
Log out of LeadDesk, download the latest version of LeadDesk at https://leaddesk.com/downloads/ and install it. Log in to LeadDesk to try again, if the error persists, check the blue VoIP button (1) as below:
if the Currently Used VoIP Settings shows username (2) as 1000, please try to clear your browser cache and try again - if the issue still persists, please contact your LeadDesk Admin
As an admin:
In your admin view, go to "Agents" tab, then modify the agent account in question - make sure that "VoIP account" is set to "Automatic VoIP account" and click on "Save" (even if there were no changes made.
Now ask the agent to try logging in again to test.
If this does not solve the situation, please contact LeadDesk support for further assistance.