New York World Phone

Fring now support windows mobile.

Here is the description from fring’s website:

fring™ is a free mobile VoIP software that lets you talk and live chat (IM) using your handset’s Internet connection instead of costly mobile airtime (GSM) minutes. fring enables free mobile calls over Wi-Fi Internet access or your GPRS, EDGE or 3G Internet data plan.

fring lets you easily communicate with all your fring, Skype®, MSN® Messenger, Google Talk™ , Twitter and regular phone contacts from one, integrated contact list. fring also supports SkypeOut and hundreds of SIP-based services such as GizmoProject, VoipCheap, VoipStunt, Free World, even from non-SIP enabled handsets, enabling cheap local and international VoIP calls to contacts’ PCs, mobile phones and landline numbers. fring is also enhanced with real-time contact availability (presence) so you can see who’s available before dialing.

Here is a post about fring.

It looks like fring’s service is unstable. But at least, fring could be used as a free sip-client for mobile. I’ll see how it goes.

GoTalkMobile - GTalk J2ME Client

http://www.gotalkmobile.com/gotalkmobile_supported_phones.html

GTalk2Voip - Talkonaut

Talkonaut™ is freely available, voice capable, Google Talk™ like application for your mobile phone. Talkonaut works on a large scale of mobile phones with Java (J2ME) support, including Windows Mobile and Palm handsets. Talkonaut™ supports Jabber, Google Talk, ICQ, MSN, AIM and Yahoo networks for chatting and Google Talk, MSN and Yahoo for voice calls.

http://www.gtalk2voip.com/

http://www.talkonaut.com/home.shtml

OctroTalk

OctroTalk. Mobile Instant Messaging with full voice integration. This always-on product keeps you connected with your buddies, and your buddies reach you whenever, wherever. Works seamlessly over GPRS/EDGE/CDMA/Wifi/Bluetooth data connections, and cuts down your phone bills. OctroTalk now supports GoogleTalk/Jabber, MSN, AIM, ICQ and Yahoo.

Complete VOIP product. Access to PSTN (soon) .

It enable us to call on mobile MSN, Yahoo Messenger etc besides chat.

http://www.octro.com/

TiVi

TiVi Phone is a free software product that enables to make and receive VoIP calls, real time video calls, and also provides a chat function. More over - the communication between Tivians is for free, but dynamical use of 3G, WiFi and Bluetooth networks lowers the costs on the all of your mobile communication.

TiVi Phone is available on the smart mobile devices like Nokia N70, N80, N91, E60, E61, E70, Treo 700w, Qtek, iMate, PDAs (and more). You can easily find and download a compatible version of TiVi Phone here. It?s also possible to transfer the TiVi Phone application to your phone via Bluetooth or to copy that on your phone by using Nokia PC suite. Just some simple steps to install TiVi Phone and you can use it everywhere and for free! TiVi Phone works over 3G, WiFi and Bluetooth networks. With this application you can make mobile-to-mobile calls, mobile-to-landline calls, and mobile-to-PC calls wherever you are. Try it today - Tivians are already talking from their mobiles for free!

SIP PORT:5060
Domain:reg.tivi.lv
Proxy:reg.tivi.lv
Outbound Proxy:reg.tivi.lv

http://m.tivi.com/?more=1

http://www.tivi.com/

Gtalk2Voip updated their services. Now they have Follow-Me and CallBack features.

Here is a summary of their services:

Using GTalk2VoIP you can:

- Make calls from Google Talk, Yahoo or MSN to any mobile or landline phone (PSTN)
- Make calls to other Google Talk, Yahoo! and MSN/Live Messenger users or SIP phones (SIP URI)
- Create voice conferences with other Google Talk, Yahoo! or MSN/Live Messenger users
- Send or receive voicemail from/to Google Talk, Yahoo! or MSN/Live Messenger users
- Receive calls to your Google Talk, Yahoo! or MSN/Live Messenger from mobile or landline phones (PSTN) by using DIDs or via SIP Broker service
- Receive calls from SIP phones, including Gizmo Project, InPhonex, SJPhone and others
- Send SIP/SIMPLE instant messages to SIP phones

Here is their detailed services list:

http://www.gtalk2voip.com/gtalk_services.shtml