Method and device for releasing temporary destination node of H.248 protocol

Abstract

The invention discloses a method for releasing a temporary destination node of an H.248 protocol. The method comprises the following steps: setting a protective timer for the temporary destination node; confirming whether release abnormality exists in the temporary destination node when the protective timer is overdue; releasing the temporary destination node if the release abnormality exists in the temporary destination node; and returning from the execution of setting the protective timer for the temporary destination node if the release abnormality does not exist in the temporary destination node. The invention also discloses a device for releasing the temporary destination node of the H.248 protocol, comprising a timer setting module, a first confirming module and a destination node releasing module, wherein the timer setting module sets the protective timer for the temporary destination node, the first confirming module confirms whether the release abnormality exists in the temporary destination node or not when the protective timer is overdue, and the destination node releasing module releases the temporary destination node when the release abnormality exists in the temporary destination node. The method and the device can successfully release the temporary destination node no longer used by an MG.

Description

technical field [0001] The invention relates to a next generation network (NGN, Next Generation Network) call control technology, in particular to a method and device for releasing a temporary termination point of the H.248 protocol. Background technique [0002] Such as figure 1 As shown, the H.248 protocol is one of the interface protocols of Media Gateway Controller (MGC) / soft switch (SS, Soft Switch) and Media Gateway (MG) in the NGN softswitch network; MGC / SS communicates with MG through the H.248 protocol Communication, to complete the control of the call state related to the media channel connection control in the MG. The connection model defined by the H.248 protocol includes two main concepts of endpoint and context. Among them, the endpoint encapsulates parameters such as media stream parameters, modem and bearer capacity, and is a logical entity of the media gateway, which can send or receive one or more A media stream; a context is an association between a set ...

AI Technical Summary

Problems solved by technology

In practical applications, the protocol messages defined by the H.248 protocol are transmitted on the User Datagram Protocol (UDP), but the unreliability of UDP transmission may cause the protocol messages defined by the H.248 protocol to fail to reach the destination in time or lost, wherein, if the lost is the release of the temporary termination command, the temporary termination corresponding to the release of the temporary termination command will not be released; if it cannot reach the destination in time or is lost, it is the response of the creation of the temporary termination command message, the MGC / SS retransmits the Create Temporary Termination Command. If the MGC / SS retransmits the Create Temporary Termination Command, the transaction to create the Temporary Termination created after the MG received the Create Temporary Termination command for the first time has timed out and delete, it will execute the retransmitted create temporary termination command again to create a temporary termination, so that the MG has added two temporary terminations, but the MGC / SS thinks that the MG has only successfully added a temporary termination, and will only Issue the release temporary endpoint command for the temporary endpoint that it believes has been added successfully, resulting in another temporary endpoint that cannot be released

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