How to concect/Sync my ERP database with eM Cliente

Hi have a ERP with framework that uses SQLserver and i have a contact table ,
I need to sync with eM client in both ways

how to connect with SQLlite eMclient, what files, and password ?

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sample sync the incoming and outgoing emails with a SQLSERVER table to connect to the customer or supplier. and answer true ERP and eMclient Send

Hello Cesar,
you cannot synchronise directly to the database files, it is strongly not recommended.
I’d suggest creating some online service for your contacts (Google contacts, iCloud contacts, cardDAV,… ) and synchronizing through this.