ATCOM IPPBX IP08 - PSTN Call Management: Outbound and Inbound; Ensuring FXO Module Installation for PSTN Calls

IPPBX IP08 User Manual
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5.2 Check Service Provider Status
After setting service provider in the other PBX, the status will become to Registered.
5.3 Make outbound calls
Go to PBX Settings -> Outbound Routes, click to add an outbound route.
The setting here is as same as that for SIP trunk, please refer to Chapter 4.3 to set it.