IP communication apparatus and IP communication method of such apparatus
    1.
    发明授权
    IP communication apparatus and IP communication method of such apparatus 有权
    这种装置的IP通信装置和IP通信方法

    公开(公告)号:US08144704B2

    公开(公告)日:2012-03-27

    申请号:US12050515

    申请日:2008-03-18

    IPC分类号: H04L12/28

    摘要: An IP terminal apparatus has a SIP controller, a UDP packet controller, and an RTP controller. The SIP controller transmits and receives a call control message in order to establish a connection to and from a destination apparatus. The UDP packet controller transmits and receives media data with the destination apparatus in a media session after the connection was established. The RTP controller obtains source port number information of a media data packet that the UDP packet controller has received from the destination apparatus, and sets the obtained source port number as a destination port number for a packet to be transmitted to the destination apparatus. Thereby, a feasible range of NAT traversal can be improved in a simple and secure manner, even when at least one relay apparatuses employs symmetric NAT.

    摘要翻译: IP终端装置具有SIP控制器,UDP分组控制器和RTP控制器。 SIP控制器发送和接收呼叫控制消息,以便建立到目的地设备的连接和来自目的地设备的连接。 UDP分组控制器在建立连接之后,在媒体会话中与目的地装置发送和接收媒体数据。 RTP控制器获取UDP分组控制器从目的地设备接收到的媒体数据分组的源端口号信息,并将获得的源端口号设置为要发送到目的设备的分组的目的端口号。 因此,即使当至少一个中继装置采用对称NAT时,也可以以简单和安全的方式提高NAT穿越的可行范围。