[SR-Users] Soft phone Issue

Hello, I have configured a kamailio server on my local network, gave it a dummy domain like "abcd.tk". I have a number of computers on my local network. I want to run eyebeam on them and connect to my kamailio server. Server is running fine. When I try to connect Eyebeam to Server, it goes to DNS to find IP for "abcd.tk". I have entered the value "192.168.1.10 = abcd.tk" in "hosts" file of all machines. File is located at "C:\WINDOWS\system32\drivers\etc\hosts". On other hand, when I ping abcd.tk from client computers. They ping 192.168.1.10. So Operating systems verify the entry "192.168.1.10 = abcd.tk", but problem lies with soft phones. I have tried X-Lite and Eyebeam. How can I make softphone understand that abcd.tk = 192.168.1.10 and please go to this adress, not DNS ?? Help please :( Regards, Awais.