Connection establishment method and system of SIP call center system, and storage medium

The invention discloses a connection establishment method of an SIP (Session Initiation Protocol) call center system, which comprises the following steps of: in response to a call request received by a client from a user to the SIP call center system, adding the user into an RTC (Real Time Communication) room through the client, and sending a call establishment request carrying a room identifier of the RTC room to a voice platform; the voice platform initiates a call to the SIP call center system based on the call establishment request; the voice platform initiates a call to the RTC gateway and instructs the RTC gateway to join in a room specified by the room identifier; and the voice platform bridges calls initiated to the SIP call center system and the RTC gateway, and establishes communication connection between the SIP call center system and the APP through the RTC gateway. By applying the application, the SIP call center system of the enterprise can be called through the enterprise APP, and the connectio