QTech, Inc has released an alpha version of speaQ–a SIP enabled softphone for Windows and Linux Powered Smartphones. More details on speaQ can be found here.

Alpha Trial of speaQ includes:

* Standard Dialing
* Incoming, Outgoing, Missed call log
* Caller Id
* Last Dialed Number recall
* Mute
* Ring Tones
* STUN support for firewall communication