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Some questions about cluster security mode on CUCM

Hello,

I am currently working on the cluster security mode on CUCM and I have some questions about it. I have 2 ip phones (6941 and 9951) which have downloaded a CTL file. They are supposed to receive a LSC from the CAPF. These are the questions :

Can I increase the life cycle of the LSC ?

What happen when the CAPF self-signed certificate expires ?

What happen when the LSC expires ?

Are the certificates re-generated automatically ? Is a reboot of the ip phones and servers necessary ? 

Where can I see the certificates which are sent by the CAPF ?

Thank you for your future answers.

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