I've spent quite some time looking for programs able to run my SIP VoIP desktop client on Tynt. On WinXP I use X-Lite with VoIPDiscount and I know for sure it's possible to configure X-Lite with many other SIP based services like VoIP Stunt.
Is there a tested client for Tynt? All I've found was for PPC2003 and I got errors all over. Ideal'd be a client working with both UMTS and WiFi, but WiFi would suffice completely.
On the other hand, Skype works flowlessly