My Android 4.x phone supports SIP.
However, the options when to use the "Internet calling" are very limited: "For all calls", "Only for Internet calls", "Ask for each call".
I would like to use Internet (SIP) calls based on phones number (e.g. all international and long-distance calls should go via SIP, all phone number starting with +395656 xxx and local calls should go via my regular voice account).
I don't want to use any application like csipsimple, I want to use native support.