Thomson: How to Disable SIP ALG on a Thomson Router HERE SonicWALL Firewall: Under the VoIP tab, the option ‘Enable Consistent NAT’ should be enabled and ‘Enable SIP Transformations’ unchecked. Huawei: Many routers support SIP ALG (usually found in the ‘Security’ menu). Port Scan and DoS Protection should also be disabled.ĭ-Link: In your router’s ‘Advanced’ settings –> ‘Application Level Gateway (ALG) Configuration’ uncheck the ‘SIP’ option.

Netgear: Look for a ‘SIP ALG’ checkbox in the ‘WAN’ settings. Linksys: Check for a ‘SIP ALG’ option, in the ‘Administration’ tab under ‘Advanced’. TP-Link routers: How to Disable SIP ALG on TP-Link ADSL modem router The router will restart and save your changes.Ĭlick here for additional general information about DrayTek Firewall setup. If SIP ALG is enabled the result will be ” 1 “. If SIP ALG is disabled a ” 0 ” result will be returned. To check if SIP ALG is Enabled or Disabled enter this command: sys sip_alg ?

Please click here for advice troubleshooting issues with SuperHubs.īT: SIP ALG cannot be disabled in the settings of BT HomeHubs, but can be disable with BT Business Hub versions 3 and higher:ĭrayTek routers: Log in to your DrayTek via Telnet using an SSH client such as Putty: Virgin SuperHub: SIP ALG cannot be disabled in the settings of SuperHubs. Note – Many routers will re-enable SIP ALG after being powered off and on, or sometimes after a firmware update, therefore if it has been disabled in the past, and you know that the router was recently updated and powered off and on again, then it is always a good idea to log in to the router and double check the setting. Unfortunately, SIP ALG was poorly implemented in a lot of cases, which has lead to it causing more issues than it corrects and due to this, we believe that, in general, it is best disabled. SIP ALG does this by inspecting SIP packets and modifying SIP Header and SDP data. SIP ALG (Application Layer Gateway) modifies VoIP traffic with the aim of solving NAT and firewall related problems. With many companies asking their employees to work from home, a common problem when trying to use a sip phone on a home network is the SIP ‘helper’ or ALG, Here is some advice on how to disable it on the more common routers that you may encounter.

Router application layer gateway