Also \arabicnumerals is probably not what you want: this will produce an abjad-like sequence:
ا ب ج د ه و ز ...

I guess, what you want is called \arabicdecimals, and was not part of MkIV for a while.  (For instance, it is not in standard TeXLive 2015 distribution whose CONTEXT version is for sometime in the summer.)  Use the CONTEXT standalone and you should be good to go.

On Tue, Jan 19, 2016 at 5:23 AM, Wolfgang Schuster <schuster.wolfgang@gmail.com> wrote:
19. Januar 2016 um 10:55

Here is my code for the header:

\setupheadertexts
[{\righttoleft\getmarking[chapter]}] [{\romannumerals}]
[{\pagenumber}] [{\righttoleft\getmarking[chapter]}]
Use

    \setupheadertexts[pagenumber]

or

    \setupheadertexts[\userpagenumber]

Wolfgang

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