/mcpFailed to Open Device/Line Problem After a user attempts to make a call, Cisco WebDialer displays the following message: User not logged in on any device. Possible Cause • The user chose a Cisco Unified IP Phone that is not registered with Unified Communications Manager. For example, the user chooses a Cisco IP SoftPhone as the preferred device before starting the application. • The user who has a new phone chooses an old phone that is no longer in service. Solution Choose a phone that is in service and is registered with Unified Communications Manager. Destination Not Reachable Problem Cisco WebDialer displays the following message on the End Call window: Destination not reachable. Possible Cause • User dialed the wrong number. • The correct dial rules did not get applied. For example, the user dials 5550100 instead of 95550100. Solution Check the dial rules. Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 290 Placing Calls Failed to Open Device/Line