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@ craesz
There are several apps in the repo that use SIP.
I do not normally use my PC for voice calls but I have tested Pidgin lately with voice using the gmail service ..... just to see if it works.
I was not able to test the video aspect of it ..... but it shows as being available.
Look for Pidgin plugins for the extra functionality.
Others you may wish to try out
Twinkle
Ekiga
Kopete
Linphone
Qutecom
Gyache
Yes I agree with PendragonUK ..... Skype got to Win users before any were aware of the existence of SIP.
SIP was not promoted for personal use at all until the last few years. It has traditionally been a business service, so it never had any desktop clients or such things.
I use SIP through my router, which has an inbuilt Analog Telephone Adapter (previously used one I plugged into the router). This allows me to plug in a standard telephone -- wired or DECT -- and use it just like a normal landline.
The router holds a phone book with quick dial numbers .... so to call a friend in Australia I just type in two numbers in the phone and it rings through. I think the limit is about 60 numbers in my setup.
Of course I can also enter a number completely manually.
I also can use it for free calling to other SIP users around the world, regardless their SIP provider.
Just a thought .... is it Pidgin that has the Skype integration? Some one of those apps were doing something like that but not being a Skype user I did not spend a lot of time looking at it.
I probably posted elsewhere in the forum on this ..... but memory is not what it might be

regards.