Softphone over IP, audio with bluetooth

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Hi all,

I would like to use my mini2440 as a softphone, using VoIP to dial numbers.
I don't need tchat services, friend list and so on. Video could be nice
also but it is not my priority. Then I would like to be able to use a
bluetooth mic/headset to use with the softphone.

My question is: how to do that?
For bluetooth, a BT dongle with maybe bluez library could probably do the
job.
But for the softphone part, I've no idea. Do you know if something already
exist, maybe a software I could cross-compile? Or maybe somebody has
already made something similar? I have seen such a video on youtube, but
under windows CE.

I have to look closer on Linphone.

If you have suggestions, don't hesitate!

Thanks