Linking video-doorbell to sip-hass-card configurations?

Hi! I'm trying to link my video-doorbell system (2N device) to HomeAssistant through your card. However, I'm finding it difficult to set up your card to do just that. I have a standalone FreePBX server in place (not your add-on) to handle SIP calls. Would you be so kind as to give me a few hints on what I may need in terms of card configurations?