s series

  1. 3cx with yeaster s300

    Hi, i have 3cx latest version (windows) and s300 (firmware version) V1.40 0000-0000 , i want to use s300 FXO trunk to make outgoing calls from 3cx. i tried this steps https://support.yeastar.com/hc/en-us/articles/115006102527-How-to-Connect-3CX-and-Yeastar-S-Series-VoIP-PBX#step1 but it's not...