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Turn Off SIP ALG on TP-Link Router

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SIP ALG is a feature found in most network routers, it operates as a function of the firewall. It consists of two different technologies:

  • Session Initiation Protocol (SIP) – The underlying service that powers all Voice over Internet Protocol (VoIP) phones, apps, and devices. SIP manages registering devices, maintaining call presence, and overseeing the call audio.
  • Application Layer Gateway (ALG) – Routers segment your ISP and your internal network through a process known as Network Address Translation (NAT). An ALG acts as a proxy to rewrite the destination addresses in data packets for improved connectivity.

In a few situations, this can be useful, but in most situations, SIP ALG causes problems with the voice service. Very often, SIP ALG causes VoIP messages to be modified in a harmful way or simply corrupt them. In such cases, you may experience issues such as, registering your handset, one-way or no audio, dropped calls and being unable to receive calls at all.

In TP-Link Routers SIP ALG is enabled by default, we recommend disabling it.

The following example is the Archer VC series routers.

1. Open up a browser (Firefox, Chrome etc) and go to (this is the default IP address) The default username is admin and the default password is admin

2. At the top menu, click on Advanced – then on the left, click on NAT Forwarding then ALG.
3. Uncheck the box next to SIP Enabled.
tp link vc ar sip alg
4. Click Save/Apply, and the router will reboot.
5. You are a legend, give yourself a high five.

Other TP-Link Models

The location of the SIP ALG setting varies depending on the model series. Here are the locations of some other popular TP-Link models.

Deco series

tplink deco sip alg

VR Series

tplink archer vr sip alg

TD Series

tplink sip alg
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