Deleting expired certificates in IMP

[Redash6174183]

Dear team ,

I have multiple selfsigned certificates have been expired and I want to delete them.

what is the impact if any ?

what is the services to be restarted ?

can it be done during working hours ?

Certificates are 

cup , cup-ECDSA, cup-trust, cup-xmpp-s2s ,ipsec 

Also screen shot is attached

[b.winter]

Hi,
you cannot delete the self-signed certificates of the server. You need to regenerate them.
The easiest way is to regenerate all certs at once and restart the whole server (in a maintenance window).

I think @Roger Kallberg wrote a good forum article about certificates and maybe can provide the link.

[Roger Kallberg]

Here is the article Cisco UC Certificates Renewal Guide