this is for now an incomplete post. By looking for net VOIP software for windows XP, I found new ones for windows mobile. I am listing them so that I do not loose the links

• http://www.octro.com/octrotalk_ppc2_20.cab
• http://gizmo5.com/pc/products/mobile/
• http://gizmo5.com/pc/products/mobile/
• http://www.nimbuzz.com/en/mobile/download
• http://www.truphone.com

Just a collection of links about how to set up different configurations for linksys 3102 voip router.

• http://www.fredshack.com/docs/linksys_3102.html
• http://www.fredshack.com/docs/linksys_3102.html 
• http://switzernet.com/public/070723-config_UA/manuals/SPA3102_ug.pdf 
• http://www.provu.co.uk/pdf/linksys/Linksys_ATA_ADMINGUIDE.pdf 
• tones http://voxilla.com/PNphpBB2-viewtopic-t-7730.html 
• tones http://www.itu.int/ITU-T/inr/forms/files/tones-0203.pdf