Abstract: Provided are a media stream delivery method, a content delivery network (CDN) node server, a CDN system and a readable storage medium. The media stream delivery method includes: receiving a data packet of a media stream; writing the received data packet of the media stream into a shared memory; and responding to a request of a user terminal, reading the data packet of the media stream requested by the user terminal from the shared memory, and sending the data packet.

Abstract: A message sending method and device, and a code stream processing method and device are provided. In the message sending method, a first server acquires and caches a code stream which is the same as a code stream of a second server; the first server acquires an initial position for sending the code stream; and after the second server stops sending the code stream, the first server constructs a message corresponding to the code stream, and sends the message starting from the initial position according to a source Internet Protocol (IP) address of the second server.

Abstract: A message sending method and device, and a code stream processing method and device are provided. In the message sending method, a first server acquires and caches a code stream which is the same as a code stream of a second server; the first server acquires an initial position for sending the code stream; and after the second server stops sending the code stream, the first server constructs a message corresponding to the code stream, and sends the message starting from the initial position according to a source Internet Protocol (IP) address of the second server.

Abstract: A method for synchronously implementing media switch in gateways used for IP FAX is disclosed. The method comprises sending a message for notification of fax event from a media gateway which firstly detects a fax event to the other media gateway of the fax event; implementing a media switch in the media gateway which firstly detects the fax event into fax mode; implementing a media switch in the other media gateway of the fax event into fax mode after receiving said message for notification of fax event. Therefore, the method of the invention overcomes the disadvantages of the related art and more particularly prevents fax failure due to difference of routing for a born network and cross-domain. The IP FAX used by the method of the invention can be applied broadly as the method also improves compatibility and reliability for IP FAX.

Abstract: The present invention discloses a method for acquiring program content and a set top box. The method comprises: an STB acquiring a downloading address corresponding to predetermined program content, wherein the predetermined program content is program content which the STB needs to download; and the STB downloading the predetermined program content according to the downloading address. The present invention solves the problem in related art that no implementation of video on demand service downloading function is provided, achieves active downloading of the STB and improves user experience.

Abstract: A method for synchronously implementing media switch in gateways used for IP FAX is disclosed. The method comprises sending a message for notification of fax event from a media gateway which firstly detects a fax event to the other media gateway of the fax event; implementing a media switch in the media gateway which firstly detects the fax event into fax mode; implementing a media switch in the other media gateway of the fax event into fax mode after receiving said message for notification of fax event. Therefore, the method of the invention overcomes the disadvantages of the related art and more particularly prevents fax failure due to difference of routing for a born network and cross-domain.