下一代网络是集话音、数据、传真和视频业务于一体的全新网络。

NGN is the complete new network which supports voice, data, fax and video services.

youdao

下一代网络是集话音、数据、传真和视频业务于一体的全新网络。

NGN is the complete new network which supports voice, data, fax and video services.

youdao