The solution for this problem with the MAC-addresses was so set this commands on the Cisco Catalyst ports (with IP-phones with inbuilt switch and other unmanaged switches connected to Cisco Catalyst switches): switchport port-security aging time 2 switchport port-security aging type inactivity So, the switch forgets the MAC addresses on this port after 2 minutes. Then you can plug the devices to another place and it works. Since then I didn´t had this problem, and I don´t know if Meraki MS switches handels this otherwise, because for them I don´t have an "forget MAC addresses" command.
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