What if Traffic is not forwarded through Required UDP Ports?
Have you ever run into a situation where your router just won’t work as you expected or configured it and you don’t know why? It’s irritating when that happens to you, but it is potentially disastrous if it happens to a business network.
While your IT team should be able to handle most network problems, you can save a lot of time and money by handling these matters yourself. Presented here is an uncommon network problem and its possible solution.
Networking is a terrific way to make sure that your clients are able to move freely over the network while maintaining access to all their business requirements. However, you may face problem on cisco 1921 router where primarily voice traffic was going over UDP port 5060 before configuration but after re-routing / reconfiguration of voice traffic through t1 card of router, the traffic is flowing through different ports.
If you encounter this problem, try using this command “no IP nat service sip UDP port 5060 ” to force the router to forward traffic on only selected number of UDP port. If by default this command is not available on router then add this command and see the difference.
Using this command might solve this problem, but it is also possible that you may need to use policy-based routing (PBR) technique or replace the hardware entirely.