Prefix gets deleted


since a few weeks we are having some Problems.

Here are some informations:

Asterisk 13.22.0
FreePBX 12.7.5-1807-1.sgn7
Phones: only Snom Phones

We need to type a 0 as prefix before dailing out (0 0123456879)

On the most calls that works perfect.
But sometimes when we dail 00123456789 it stands in the display an when we press “call” it switches to 0123456789 and we can’t dail out

I hope someone can help me

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