Abstract: The present invention provides a dynamic network address translation system and method of transparent private network device. With the NAT approach, the first device in a public network can be connected to a second device in a private network. The first packet for the connection is sent from the first device in the public network to the second device in the private network. Before establishing the connection, the first device exchanges information between the NAPT router of the private network. The NAPT router maintains its translation table according to the information. Then, the first device sends a connection request to a specific port of the NAPT router, and the packet will be transformed and routed properly to the second device.

Abstract: A memo voice recording/playback method and a digital photo frame using the method are provided. The method is suitable for a digital image playback apparatus. The digital image playback apparatus has memo voice recording function and memo voice playback function and includes a display unit for image displaying. The method includes: displaying an image; judging whether memo voice recording function of the digital image playback apparatus is enabled or not; and executing a memo voice recording procedure to edit the recorded memo voice into a memo voice file associated with the image if it is judged that the memo voice recording function is enabled.

Abstract: The present invention provides a dynamic network address translation system and method of transparent private network device. With the NAT approach, the first device in a public network can be connected to a second device in a private network. The first packet for the connection is sent from the first device in the public network to the second device in the private network. Before establishing the connection, the first device exchanges information between the NAPT router of the private network. The NAPT router maintains its translation table according to the information. Then, the first device sends a connection request to a specific port of the NAPT router, and the packet will be transformed and routed properly to the second device.