Error | "399: line not configured" when registering a Softphone with CUCM
Learn how to resolve the error when attempting to register a softphone with Cisco Unified Communications Manager.
Message
"399: line not configured" when registering a Softphone with CUCM.
Definition
"399: line not configured" is a message from CUCM meaning it is expecting a specific extension for the Digest User.
Solution | Workaround
To resolve, verify that the Digest User extension number matches the User Name field of the Softphone setup. This includes the full extension number. So, if the site uses a 5 digit or 10 digit extension, this must be the same in the User Name field of the Softphone setup.