How much does it cost to develop a system that integrates OA, CRM, instant messaging, email, SMS, and outbound calls, and uses cloud processing to achieve multi-user web management?

If you develop it yourself, it will cost tens of millions to make it decent, and it will probably take more than 3 years, which is very time-consuming and labor-intensive. But I have a quick way to implement your system. Dingdang Wangyetong instant messaging has a standard interface and can integrate other third-party software. The cost is relatively low and the stability is relatively good.