c6dbaba9_ent_Error_Codes___Tom_Talks_UC__Additional_Information
[Mode] Voice [Error Id] 504 [Error Message] Cannot complete the transfer. [Additional Information] 
Call was not transferred because there was a problem with the calling service. Wait and then try again. If the problem continues, contact your support team with this information.
Lync Client Error Codes | Tom Talks UC
Additional Information