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s20 outgoing call failed to +31 prefix

Situation:

S20 with 8 extensions, 2 sip trunk and 2 FXO ports.

ONLY when i try to call holland numbers (prefix: 0031) the call fail.

Is not sip trunk problem, i've tried with direct connection to sip trunk with success.

In the system log i see that tha call is failed, but i don't understand the reason.

All other international calls works good.

I can't call only holland numbers! STRANGE?

What can i do??

Thx.

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