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Forum Discussion
R7000P V1.3.3.140_10.1.75 forward sip message , don't change ip.src
Hello everyone, I am developing a VOIP software system and I have noticed an issue: the Netgear R7000P router does not modify the value of the ip.src field of the UDP message when forwarding SIP (...
Hi StephenB，
Thank you for your reply. You are right, the WAN port of Huawei is connected to the LAN port of R7000P, and the markings in my picture are incorrect.
Additionally, I understand what you're saying. The R7000P forwards packets from one LAN port to another, which is a function of a layer 2 switch and does not trigger routing or NAT processing. Binding a Polycom SIP phone to port 5060 and a non 5060 port yields different results. This is because Huawei routers have processed SIP ALG, meaning that they have not modified the ip.src. Therefore, when the message reaches SBC, the ip.src remains at 192.168.1.153 When SBC responds to SIP REGSITER requests, it will first send to the gateway (192.168.0.1). R7000P does not know where 192.168.1. x is located, so as long as a static route 192.168.1.0/24 to 192.168.0.10 is configured on R7000P, which is a Huawei router, I followed this method and the problem was solved.
Is my analysis correct? If there are any issues, please help point them out.
Finally, thank you for your professional answer.