Yeastar S300 and Old PABX extension integration

Hello, I am interested by the Yeastar S300. I need to integrate to it  around 20 existing extensions from an old analog PABX.

Should I need to use FXO ports adapters on the IPBX side?

There is two solution : O2 modules or external VoIP FXO gateway.

What is the difference between O2 module and the VOIP analog FXO Gateway.?

Does the O2 module simplest to configure in Yeastar S300 ?

Does the O2 module reduce latency and increase performance compared to the external Voip FXO Gateway TA24XX  10/100 LAN communication and trunk?


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