![]() ![]() > Ensure that the following are disabled (unchecked): ![]() > Ensure that Firewall and Remote Management are enabled (checked). > f needed, update firmware by going to System Management > Firmware Upgrade. > Go to System Summary and ensure that the firmware is up to date (1.1.1.06 or later). SIP ALG cannot be disabled in the settings of BT HomeHubs but can be disabled with BT Business Hub versions 3 and higher. Go to Firewall > Firewall Rules > Custom FirewallAccess RulesĬlick the “Disabled” check box next to any rules named LAN-2-INTERNET-SIP and INTERNET-2-LAN-SIP SIP ALG cannot be disabled. (See above on how to get around this) (It should return a “1”) nvram set nf_sip=0 ![]() If your router doesn’t have this option SIP ALG may be disabled via Telnet. Asus Routersĭisable the option SIP Passthrough under Advanced Settings / WAN -> NAT Passthrough. If you don’t have a telnet client installed we recommend Smartty ()Ĭonnect in telnet to the IPv4 address of your gateway and hit enter again. If your router does not have a web interface you will most likely need a Telnet client to login. Typically this is 192.168.1.1 but you just check your default gateway by typing ipconfig in Windows command prompt or ifconfig on Linux systems from any connected device on the same LAN. Most home/residential routers have a web interface. If you are still having problems after disabling SIP ALG, please check your firewall configuration. I have disabled SIP ALG but I’m still experiencing problems… Disallows server-side solutions: Even if you don’t need a client-side NAT solution (your SIP proxy gives you a server NAT solution), if your router has SIP ALG enabled that breaks SIP signalling, it will make communication with your proxy impossible.Writing incorrect port values greater than 65536 is also common in many of these routers. ![]() missed semi-colon “ ” in header parameters). Many SIP ALG routers corrupt the SIP message when writing into it (i.e. Some of them do a whole replacing by searching a private address in all SIP headers and body and replacing them with the router public mapped address (for example, replacing the private address if it appears in “Call-ID” header, which makes no sense at all).
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