| 摘要 |
A media gateway (MG) and a packet filtering method thereof are provided to enhance the adaptability of the packet filtering mechanism on the MG. The packet filtering rule for a service instance may be changed dynamically, namely, the MG analyzes the currently transmitted packets of a service instance, obtains the state change of the instance, and then dynamically changes the packet filtering rule of the instance according to the state change of the instance. The present invention extends the property parameters of the H.248 protocol or MGCP protocol and adds a property parameter that indicates the dynamic packet filtering function is enabled or disabled and a property parameter that indicates the service type so that the MGC can enable or disable the packet filtering function for the instance of the specified service type flexibly according to the values of such parameters.
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