Tenaro,Additionally here are the most common login issues. Unfortunately this includes items related to Presence implementation but I commented where we did not use these in our lab setup for CUCM Phone Capabilities only. Login Issues Problem:Jabb...
Tenaro,Please attach a Diag Log if possible from your EW-C and EW-E and we can look to see where your client may be failing in the login flow. Also could you verify the versions of the Jabber Client, EW and CUCM that you are using. ThanksFred