I don't think that i need a licence because the softphone is registering on SL2100 and run the Desktop Suite in trial mode for 90 days. I can see the mac address and the ip of the computer in the section 15-05 "IP Phone Basic Setup", but when I start the Desktop Suite, after 30 seconds(timeout) it says that cannot connect to the CTI server.
I followed this tutorial https://midwesttechnology.uservoice...g-desktop-suite-on-the-nec-sl1100-in-sof and don't know if this is available for SL2100 too.