Some Ip phones can not log in and log off even when requested by CUCM. In CUCM appears the message "Error occurred while retrieving information from database. No LOGOUT device profile". In IP phones the message is something like "error 6". The CUCM version is 5.1.3.2000-3.
Yes, they do. I already checked the configuration. That situation occurs with some phones but not with all the phones. The phones have the same configuration.
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