![]() ![]() # show full-configuration system settings Save these settings and reboot the device if requested Next, find the “Application Level Gateway (ALG) Configuration” area and uncheck the box for SIP. Uncheck the box to disable SPI – usually, directly below this item are options for “NAT Endpoint Filtering” that must be changed to “Endpoint Independent” for both TCP and UDP. Go to “Firewall Settings” under the “Advanced” item. Open a browser and enter the router’s IP address in the address bar. (config)# no ip nat service sip udp port 5060 (config)# no ip nat service sip tcp port 5060 While ALG could help in solving NAT related problems, the fact is that many routers’ ALG implementations are wrong and break SIP. Many of today’s commercial routers implement SIP ALG (Application-level gateway), coming with this feature enabled by default.
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