Talkanaut : Talk free from your phone to Gtalk users worldwide !

Here is an interesting article.................

Talkonaut 4.0, native (SIS) Symbian S60 edition released.
26th of February 2008.
Mobile VoIP the way it meant to be. During last 6 months our team had been working on two major improvments to our Talkonaut mobile application: 1. moving Talkonaut application to native Symbian S60 platform, and 2. implementing real VoIP stack that allows Talkonaut users to make voice calls over most data connections your mobile phone might have, such as: GPRS, EDGE, 3G and WIFI. With this new 4th release of Talkonaut we present our achievments in these directions, we believe all they make Talkonaut more consistant, outstanding and break-through mobile VoIP + Chat application ever available.
Features:
Talkonaut 4.0 was entirely rewritten in C/C++ and now runs on Symbian S60 3rd edition based Nokia smart-phones. Moving from Java to native platform allowed to reduce memory usage, improved speed and to add some functionalities that were not previously available for Jave applications, like VoIP, access to file local system (improved file transfer) and interaction with other applications (Web Browser for opening URLs right from chat window).
Using a set of narrow-band Speex codecs and relying on Jingle Audio extension to XMPP protocol (same as implemented in Google Talk), Talkonaut now brings to the world a very powerful combination of IM chat, Presence and VoIP calls made over data connection. Unlike standard SIP stack, that is available on some Nokia smart-phones, Talkonaut is not bound to WIFI only, and can make calls over GPRS, EDGE, 3G or WIFI. Talkonaut does not require to do any VoIP configuration and overcomes all the hassle with SIP settings.
Talkonaut 4.0 allows to make free VoIP calls to Google Talk users, to SIP phones, to MSN, Yahoo, AIM and ICQ voice capable IM clients, as well as to other Talkonaut fellows.
Talkonaut 4.0 allows to receive free calls from SIP phones (or any other VoIP networks), from Google Talk, MSN, Yahoo, AIM and ICQ users.
Talkonaut 4.0 allows to make cheap VoIP calls (check our rates) to any mobile or landline phone number in the world.
Talkonaut 4.0 allows to define any number of SIP accounts and use them to make free or cheap calls over third-party VoIP/SIP carriers. A flexible Dialing Plan feature is helpful for choosing routes to destinations between different carriers.
Talkonaut 4.0 is fully equipped with all the features previously available in J2ME version of Talkonaut 3.0, inherits the same graphical user interface and menu structure.
Talkonaut 4.0 runs on the following sets of Symbian S60 based Nokia smart-phones:
2nd Edition: N70, N72, N90
3rd Edition: 3250, 5500, 5700, 6110, 6120, 6121, 6290, E50, E51, E60, E61, E61i, E62, E65, E70, E90, N71, N73, N75, N76, N77, N80, N81, N81 8GB, N82, N91, N92, N93, N93i, N95, N95 8GB
Talkonaut 4.0 can be downloaded over-the-air using mobile web browser from http://get.talkonaut.com/, or via PC from http://www.talkonaut.com/download.shtml.