OSS/BSS Market (By Solution: OSS [Service Assurance, Network Management, Inventory Management], BSS [Billing and Revenue Management, Service Fulfillment, Customer and Product Management]; By Deployment Model: On-premise, Cloud; By Enterprise Size: SMEs, Large Enterprises; By Application: IT & Telecom, BFSI, Media & Entertainment, Others) - Global Industry Analysis, Market Size, Opportunities and Forecast 2020 - 2027