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Incomming Call problem with UC520-24U-4BRI

Hello,

On a UC520-24U-K9-4BRI connected on a BIV ( Internet Voice Business) France Telecom operator ( France), we have some problems with incoming calls.

When the incoming call (not all), the caller hears a continuous tone and nothing happend!

In attached the configuration of the UC520.

Thanks for your Help.

Frederic

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