A VoIP PBX phone system designed for both residential and commercial use enables comprehensive management of various features such as extensions, voicemail, IVR, call queues, and music on hold, among others. Additionally, this system can notify one or multiple customers simultaneously through calls, emails, or text messages (SMS) via the Web Invoice feature. Furthermore, Web Invoice serves as a complete point-of-sale (POS) solution, facilitating sales transactions in both online and physical stores. It allows for the management of multiple cash registers, tracking the cash flow in each register, and includes capabilities for scanning and printing barcodes. Moreover, with Web Invoice, customers and guests can conveniently log in online to create purchase orders, make payments using credit cards or PayPal, and place orders for either pickup or delivery. This all-in-one solution enhances the efficiency of business operations and customer interactions.