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Do you mean delete analog and digital ports for port capacity free up? You have to delete unusable extensions by cm1000. But besides Port Capacity Lic you need free IP Ports Lic for ip-terminal.
Ok, if I'm right, you have 9 ip terminals and 23 free IP Port lic. Use SV8300 PcPro for delete unusable extensions (cm10 y=00).
If they are IP phones, I suggest you de-register them before removing them. Use CMD 1290>ext#>0:exe. This will de-register the extension to mac address. It should also reduce the number of registered IP phones vs license. 166/167.
Are you sure you delete unusable extensions? Run cm771 for deleted extension - "DATA NOT FOUND"?