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Problem with outbound calls on s20 through TG400

Hi yeastar support,

I'm Jack, and i'm using yeastar products, s20 & TG400. when i installed the equipments, i was able to make and receive calls. but since two days, when i try to make outbound calls, i receive this error notification:"the dialed number is incorrect". i precise that i have put any restriction on outband calls.

what can i do to resolve this issue? my TG version is V3

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