I've packaged up the slackware twinkle txz as an sfs file, with all required library files, including Qt3.Twinkle is a softphone for your voice over IP and instant messaging communcations using the SIP protocol. You can use it for direct IP phone to IP phone communication or in a network using a SIP proxy to route your calls and messages.
I've uploaded it here. (5.56Mbytes)
Run via Menu>Network>Twinkle