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Yeastar S-Series/TA1610: Outgoing Call Problem

Hello everyone,
I have YEASTAR S300, TA1610 with 8 PSTN and 8 extensions. I have assigned to each extension a PSTN line.
Incoming calls work. When a call arrives, it is redirected to the corresponding extension.
Outbound calls also work but the problem is that all calls go through the same line while I have assigned to each extension a FXO line (Example : Call Destination : In IP-PORT, on the TA1610. I don’t want to use PORT GROUP

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