Does CRM replace our current sales system or integrate with it?
The default is Odoo CRM, because it shares one database with inventory and accounting — a quotation becomes a sales order and then an invoice with no re-keying. If you run a sales system you want to keep, we first inspect its APIs and its ability to exchange customers and orders, then decide: integrate, replace one channel gradually, or keep it and connect reporting. We will not promise an integration before inspecting the interfaces.