hi, normally it's safe to send and ask visa per post as you don't have a ambassy in Norway
by the fact in russian as in Moscow and Irkoust and Ulan de you can ask visa for mongolia, it's take around 5 days have photo with you
as we go often there we can maybe halp you more to prepare your trip? just have a look on http://www.terramongolia.com and of course email me for any questionsa bout Mognolia
we can give our good contacts, theyx can come to pick you free, lodge in samll guest house and provide for more if necessary
if you need maybe as you ask visa in russia an invitation letter they can provide it in some hours just contact mejet69@yahoo.com
have nice trip