And video-linked gateway device, provides a system and method for implementing a video call service. With this structure, it can cope with the situation to change the destination of the call H.324 entity without the release of the connection. System for implementing a video call service, a video-linked gateway device, a broadband access device and a resource. Video-linked gateway apparatus performs the calling H.324 entity and the parameters negotiated in need of broadband device resources to perform the video call service to the video playback style, and the obtained parameters of the calling H.324 entity following discussion, to connect the calling party H.324 entity to the broadband device resources. Video-linked gateway device is the called party by performing a H.324 entity and the parameters consultation, to obtain the parameters of the called party agreed H.324 entity, the parameters negotiated with the destination entity in the originating H.324 H.324 entity of the video call service transmitting the parameter to each other in a narrow sense, and releases a connection with the calling H.324 entity broadband device resources.
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