Earlier, H.323 phones used HTTP to back up and restore the call logs to the Apache server. But, any calls received while the phone is logged out were not reported to the user upon login. SIP desk phones stored the call logs in the phone because the SIP desk phones did not have any central storage. When a SIP user logged in from a different desk phone, the user could neither see the old call log history nor any information about the calls received while the phone was logged out.

With this enhancement, the H.323 and SIP desk phones back up all the call logs and restore them when the user logs in. Communication Manager backs up up to 10 calls for the logged-out H.323 users. The H.323 station stores the call logs when the user has logged into the station. Session Manager backs up up to 100 calls per station for the logged in and logged-out SIP users.