By default, SCCP phones send a keepalive to their primary CUCM server every 30 seconds and to their failover node, which is the second node listed in the phone's Call Manager (CM) Group, every 60 seconds.
The phone will wait for three failed SCCP keepalives in a row before considering that node unavailable. After the third failed SCCP keepalive, the phone will fail over to its secondary CUCM server.
Though it is for SCCP IP phones, it is applicable for SCCP VG224 also.
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...