Signaling transmission method and device

Abstract

This invention discloses a method for transferring signaling including: after a signaling transfer device receives a registered messge, it sets up an address mapping list according to the address information carried in the registered message head and matches signaling for transferring the address mapping list. This invention also discloses a signaling transfer device including: a signaling receiving unit used in receiving signaling, a set-up unit for address mapping lists setting up address mapping list according to the address information carried in the registered message head and a signaling transfer unit used in transferring signaling based on the list.

Description

technical field [0001] The present invention relates to the communication field, in particular to a signaling forwarding method and device. Background technique [0002] In the NGN field, the separation of signaling and media is a major trend. The forwarding device is controlled by the signaling device, so as to achieve the purpose of separating the signaling from the media. Generally, the GATE (gateway) device completes the forwarding of signaling and media packets, while the GC (Gate Controller gateway control) completes the control of the GATE, and the CA (CallAgent call agent) completes the call control. Wherein, the GC and the CA may be physically located in the same device, or located in different devices. [0003] Please refer to FIG. 1 which is a signaling forwarding process in the prior art (taking the forwarding of a registration message as an example). [0004] (1) The NGN terminal goes online and sends an address allocation request and authentication informati...

AI Technical Summary

Problems solved by technology

When there is a NAT device between the terminal and the GATE, the uplink session (message (7), sending signaling from the NGN user side to the network side is called uplink, otherwise (8) is downlink) uses the real terminal address ⑥, After the signaling passes through the NAT device, the source address in the message header is not ⑥, and when the message reaches the GATE, it cannot match the previously created table entry (⑥-->①..②-->⑦), it will As a result, the signaling cannot match the created session, resulting in signaling forwarding failure

[0014] The GC / CA device triggers GATE to create an address mapping table based on the address assigned by the DHCP Server. The source address of the client in this mapping table does not carry port information; the source address of the client in the message header carries the port of the registration message, and the registration message is forwarded to the gateway. After matching the address mapping table created, the client source address port information in the registration message is added to the address mapping table after matching, and the message is forwarded to the GC / CA device; if a malicious user sends a message carrying the same client source address and other port packets, the gateway replaces the port corresponding to the original address of the client in the original address mapping table according to the new port information. When the CG / CA device forwards the downlink session to the gateway, the address information carried in the session will The address mapping table in the gateway does not match and the forwarding of the signaling fails

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