Knowledgebase ECSTA Current: ECSTA for OpenScape Business has no connection after update from V2 to V3 ECSTA for OpenScape Business has no connection after update from V2 to V3 State of knowledge February 2023Subject: ECSTA for OpenScape BusinessAtos/Unify OpenScape Business updates from V2 to V3 ObservationThe ECSTA for OpenScape Business cannot connect to the PBX after updating an OpenScape Business from V.2 to V.3.Possible causeMissing or incorrect licensing of the CSTA interface in the telephone system.Checking possible causesVerify under "License Management" on the installation whether a valid CSTA license is stored.SolutionEnter a valid CSTA license in the attachment.