@BlackCuervo Avaya helped me check this case, seems like network issue. I don't have Wireshark logs, so I can't determine the root cause. All I know is 1. CM doesn't lose connection. 2. The disconnect request was from farend side (IP-Phones) 3. IP-Phones aren't designed to disconnect themselves.
While it happened IP phones just froze and couldn't respond to buttons.
Diagnostics > System logs > IP events output example
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20240625:163604000:248182:lxsys:MED:cmb logmanager: IPEVT IPT_REG board=PROCR ip=10.102.40.10 net_reg= 1 ext= 29443 ip= 192.168.182.244;49302 net_reg= 1...
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