For interested people: According to my tests, it should work when really in different places (different public IP) or behind a normal router (without SIP ALG) if each phone listens on a different port.
In my current situation I cannot test more but, nevertheless, I managed to make ring both phones. There was just no sound, but this is certainly due to SIP ALG feature "confused" for audio channels.
Thanks again to emoci for this valuable information...
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