Apache server setting: Redirect for URL with umlaut characters

We have using Apache httpd service on CentOS 5 (Kernel: 2.6.18-8.1.10.el5PAE).
We need to define the redirect for a URL with umlaut characters.

So, for "standard" URL it work OK, something like:
<VirtualHost *:80>
ServerName www.sitename.com
ServerAlias www.sitename.ch
RewriteEngine On
RewriteRule ^/$ http://oursite.com/link1 [R]
</VirtualHost>

Now, we have URL with umlaut character: www.öurl.ch (which DNS points to our server IP, of course) and we would like to redirect it to: http://oursite.com/link2

How can we do this mapping?

P.S. By specifying ServerName www.öurl.ch we do not get redirected to the desired page, but to some default page (on our server).

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