Hampton Software, a UK-based small software developer has released Articulation, a SIP client that allows you to well make SIP/VoIP calls from your Treo, as long as they are running Palm OS 5. If you are using Treo 700p, don’t bother trying this software. Of course, there are other Palm models with built in WiFi connectivity and use Palm OS 5 that can use this software. (You can download it from here.) I am not sure, but is this the first VoIP application for the Palm platform? What is your experience with this application – let me know!