What is SIP ALG?
SIP (Session Initiation Protocol) ALG (Application Layer Gateway) is an application within many routers. It inspects any VoIP traffic to prevent problems caused by firewalls and, if necessary, modifies the VoIP packets. Routers will often have SIP ALG activated by default.
Should I turn SIP ALG off?
You should disable SIP ALG because it: Interrupts SIP traffic like calls and conferencing apps. Affects the perceived reliability of desk phones and VoIP apps.
Isn’t needed when using cloud-based VoIP providers.
How to disable SIP ALG:
Zyxel VMG1312-B10D:
- Navigate to "Network Settings" and click "NAT".
- Click the "ALG" tab to toggle between "Enable" and "Disable".
Zyxel – VMG1312-T20B:
- Navigate to "Network Settings" and click "NAT".
- Click the "ALG" tab to toggle between "Enable" and "Disable".
For further assistance please get in touch with our onboarding team at voipcare@bonline.com
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