Hello.some Clients (1% from all) get the Message "Failed to start a new session. Try again" message".We've tried all Steps (deinstall Jabber, delete %appdata%, (un)check "presence Button in the user profil in CUCM)  but these People are unable to log...

Hello,i'm using CUCM v. 9.1.2.12901-3 and CUCM IM & P v.9.1.1.51900-5.i have activated LDAP-Synchronisation and Authentication with CUCM and a Microsoft AD. I can see the synced Users under the Point "End Users" in CUCM.Login to /ucmuser - Successful...