Steps to setup FreePBX: Creating extensions (Applications->Extensions). Configuring the trunks for the SIP-provider (Connectivity->Trunks) Customize incoming calls to PBX (Inbound Routes). Customize outgoing calls from the PBX (Outbound Routes). Creating extensions Open "Applications-> Extensions". Select "Generic CHAN SIP Device" and press "Submit" User Extension - extension number, which will be used to connect to PBX. Display Name - the display name of the user for calls (in-net). Secret - authorization...