Turn off SIP ALG: Netgear, TP-Link, Verizon, AT&T routers
SIP ALG on your router can stop a desk phone registering or cause one-way audio. Where to turn it off on Netgear, TP-Link, Verizon and AT&T routers.
SIP ALG is a router setting that inspects phone-call traffic and changes it on the way through. Grandstream warns that it can change that traffic in ways that stop phones registering or setting up calls. Netgear routers ship with it on.
Turn SIP ALG off if your desk phone shows Register Failed, or calls have one-way audio or no audio. Then restart the desk phone so it registers again.
Change only a router you manage. If your internet provider manages your router, ask them to turn SIP ALG off.
Netgear
For Nighthawk and other Netgear Wi-Fi routers, and Orbi.
- On a computer or phone connected to the router, go to
routerlogin.net. On Orbi, go toorbilogin.com. Sign in. - Click ADVANCED › Setup › WAN Setup.
- Tick Disable SIP ALG.
- Click Apply.
TP-Link
Sign in to the router's web page, or open the Deco app. Where the setting is depends on the router:
| Router | Where |
|---|---|
| Archer Wi-Fi routers | Advanced › NAT Forwarding. Clear Enable SIP ALG and click Save. |
| Some newer Archer routers, like the Archer AX72 | Advanced › Security › ALG. Turn off SIP ALG. |
| Deco mesh | In the Deco app: More › Advanced › NAT Forwarding › SIP ALG. Turn it off. |
| DSL modem routers (Archer VR, Archer VX, TD-W) | Advanced › NAT Forwarding › ALG. Turn off SIP ALG. |
Not every TP-Link model has a SIP ALG setting.
Verizon
For the Verizon Router (CR1000A, CR1000B) and the Verizon Internet Gateway (ARC-XCI55AX, ASK-NCQ1338FA).
- On a device connected to the router, go to
mynetworksettings.com. - If the browser warns that the connection isn't private, click Advanced, then proceed.
- Sign in with the password printed on the router's label. On the Verizon Router, it's next to Network Settings Password.
- From the Advanced menu, select Security & Firewall, then SIP ALG.
- Switch SIP ALG off and click Apply Changes.
Verizon's guide for the Fios Router G3100 has no SIP ALG setting.
AT&T
AT&T's guides show SIP ALG on two of its gateways:
- AT&T Internet Air for Business 5G Gateway: go to
attwifi.manageror192.168.1.1and sign in. From the Dashboard, click NAT Forwarding, then ALG. Slide SIP Passthrough to Off. - BGW830: go to
192.168.1.254and sign in with the device access code from the back of the gateway. The SIP ALG setting is on the Firewall advanced page. AT&T advises changing the firewall pages only on the advice of your service provider or a security specialist.
AT&T's guides for the BGW210 and BGW320 don't mention SIP ALG.
Routers without a SIP ALG guide
- ASUS: ASUS's guides don't use the name SIP ALG. Under WAN › NAT Passthrough there's a SIP Passthrough setting, but ASUS doesn't say what turning it off does.
- A router from your internet provider, like Spectrum or Xfinity: ask the provider to turn SIP ALG off, or whether it can be turned off.
On the routers above, SIP ALG sits under WAN setup, NAT forwarding or firewall settings, so look there first on other brands.
Still not working?
See Fix No Service, Register Failed and no audio, or email support@tonet.ai with your router's make and model.
Next step
Check that your phone registered, then make a test call. Setting up more phones? See the setup guides, or the phones Tonet sells at tonet.ai/desk-phones.
Fix a desk phone
Fix a desk phone that shows No Service or Register Failed, or has one-way or no audio: check the SIP details, turn on STUN, and turn off SIP ALG.
Click to call
Call any phone link on a web page with Tonet, or highlight a number anywhere on a Windows PC and press F6. Set up click to call and highlight to dial.