If calls using SIP or another VoIP service are dropping, checking your router’s SIP ALG setting is a low-cost troubleshooting step. Turning it off helps some setups and can hinder others; it is not a proven fix for every video-call app or dropout. The specific setting behind the headline anecdote has not been identified.
What SIP ALG does on a router
SIP ALG, or Session Initiation Protocol Application Layer Gateway, inspects some VoIP traffic and may modify it to help it pass through a router’s firewall or network address translation (NAT). NETGEAR describes the feature as enabled by default on the routers covered by its guidance.
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That intervention can help in one network and cause trouble in another. TP-Link says some VoIP apps and devices can handle firewall traversal themselves, and that this can conflict with SIP ALG. D-Link likewise notes that SIP ALG may interfere with some devices. TP-Link’s Deco support documentation says, “In this case, we can turn off SIP ALG on routers to ensure that VoIP calls will work normally.” That is conditional guidance, not a guarantee for every call or router.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsCould SIP ALG explain a video call dropping?
Possibly, if the call uses SIP/VoIP and the router’s handling of that traffic is part of the problem. The available manufacturer guidance does not establish that SIP ALG causes dropouts in all consumer video-call apps, or that it caused the particular anecdote in the headline. Don’t assume every video call uses SIP.
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If the symptom occurs with a SIP desk phone or a business voice service, ask the voice provider or network administrator whether SIP ALG should be enabled before changing it. TP-Link notes that an ISP may direct a user to disable the feature for a VoIP application.
How to check or disable SIP ALG
First identify your router’s exact model, hardware version, region and firmware. The examples below apply only to the listed product families and interfaces; menu names and availability can vary. Check the current support instructions for your exact model before making a change.
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For the WiFi 5 models and XR700 covered by NETGEAR’s instructions, open Advanced > Setup > WAN Setup, select Disable SIP ALG, then choose Apply. NETGEAR’s guidance for these models was last updated July 7, 2025.
TP-Link xDSL modem routers
On the Archer and TD-series products covered by TP-Link’s xDSL FAQ, open Advanced > NAT Forwarding > ALG and turn off SIP ALG. TP-Link notes that feature access can depend on hardware version, firmware and region.
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TP-Link Deco systems
For Deco models listed as supported in TP-Link’s FAQ, use the Deco app and open More > Advanced > NAT Forwarding > SIP ALG. The FAQ notes that availability may change with later updates.
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D-Link’s instructions for the DIR-878 use Feature > Firewall > Advanced Settings; disable SIP and save. This path is specific to the DIR-878 guidance, not a universal D-Link menu. D-Link also recommends checking that router firmware is current.
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Test the change without guessing
- Record whether SIP ALG is currently enabled so you can restore the original setting.
- If your router exposes the setting and your provider or administrator has no contrary guidance, change only SIP ALG and apply the change.
- Repeat a call under conditions as similar as possible to those in which the problem occurred. Note whether the same symptom changes.
- If the change makes calls worse or causes another problem, restore the original setting. If the symptom persists, the result does not establish that SIP ALG was responsible.
This controlled before-and-after approach is a practical troubleshooting method, not a test result established by the manufacturer guidance. If the setting is absent, do not assume it is hidden under a particular menu: consult support for the exact router model and firmware.
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