You can't/shouldn't modify destination_number, it's part of the caller profile.
You can either transfer it to 0$1 to have it hit the dialplan again, or bridge to your gateway and use 0$1 as the destination.

-Avi

On Fri, Dec 5, 2014 at 12:22 PM, Paul Klenk <markus.klenk@googlemail.com> wrote:
Hi,

I'd like to have the country code "+49" removed from
destination_number and changed to "0"

I tried:
    <extension name="international" continue="true">
      <condition field="destination_number" expression="^\+49(.*)">
        <action inline="true" application="set" data="destination_number=0$1"/>
      </condition>
    </extension>

but after correctly executing this extension-statement it reverts to
the original version of destination_number

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