Disable SIP ALG: Difference between revisions

Latest revision as of 14:17, 28 August 2019

An ALG is an 'Application Layer Gateway'. Typically it's software in a router that inspects VoIP traffic and modifies the information inside in order to try and help make VoIP work better. In practice they tend to make things worse. you may end up with one way audio, no audio or be unable to register.

Disabling an ALG on your router may well help with any VoIP problems. Here are some notes on various routers that we've come across:

ZyXEL VMG1312 and VMG3925

Usually disabled by default.

Log in to the router's web interface
Go to:
- Network Setting - NAT - ALG
Disable the settings there

Technicolor

To completely disable the SIP ALG, you will need to connect via Telnet to your router.

:connection unbind application=SIP port=5060
:saveall
:exit

(On older models/firmware the command to use is :nat unbind... rather than :connection unbind...)

Billion 7800

Click on ADVANCED, then CONFIGURATION
Click on VIRTUAL SERVER
Click on ALG
Select DISABLE
click on APPLY, then click on SAVE CONFIG

Neatgear

From Wan Setup Menu: go to NAT Filtering and check the box next to "Disable SIP ALG"

Vigor2750, Vigor2130

telnet in and:

kmodule_ctl nf_nat_sip disable
kmodule_ctl nf_conntrack_sip disable

Vigor2760

In the web interface, under Network > NAT, click the ALG tab then set the SIP ALG off

TP Link

telnet in to the router and:

 ip nat service sip sw off

If SIP ALG is disabled successfully, it will show Nat Sip v2 switch off! This will reset when rebooted and will need to be set again.

BT Business Hub

Open a browser go to 192.168.1.254
Click on ‘Advanced Settings’
Enter your admin password the default admin password can be found on the bottom of the router).
Click Continue to 'Advanced Settings'
Click Firewall then 'Configuration' and scroll down to 'Application Layer Gateway'
Click Yes next to 'Disable SIP ALG' and click Apply

ZyXEL 660 range

telnet router
Menu option "24. System Maintenance".
Menu option "8. Command Interpreter Mode".
Type in:

ip nat service sip active 0

More info

More info on: VoIP-Info

@@ Line 1: / Line 1: @@
+An ALG is an 'Application Layer Gateway'. Typically it's software in a router that inspects VoIP traffic and modifies the information inside in order to try and help make VoIP work better. In practice they tend to make things worse. you may end up with one way audio, no audio or be unable to register.
-Disabling an ALG on your router may well help with any VoIP problems. Here are some notes on various routers that we've come across.
+Disabling an ALG on your router may well help with any VoIP problems. Here are some notes on various routers that we've come across:
+== ZyXEL VMG1312 and VMG3925 ==
+Usually disabled by default.
+*Log in to the router's web interface
+*Go to:
+**Network Setting - NAT - ALG
+*Disable the settings there
+== Technicolor ==
+To completely disable the SIP ALG, you will need to connect via Telnet to your router.
+ :connection unbind application=SIP port=5060
+ :saveall
+ :exit
+(On older models/firmware the command to use is '':nat unbind...'' rather than '':connection unbind...'')
 ==Billion 7800==
-#Click on ADVANCED --->CLICK CONFIGURATION
+#Click on ADVANCED, then CONFIGURATION
 #Click on VIRTUAL SERVER
 #Click on ALG
+#Select DISABLE
-#Click on -DISABLE ->>CLICK ON APPLY ->>> CLICK ON SAVE CONFIG
+#click on APPLY, then click on SAVE CONFIG
+== Neatgear==
+From Wan Setup Menu: go to NAT Filtering and check the box next to "Disable SIP ALG"
+==Vigor2750, Vigor2130==
+telnet in and:
+ kmodule_ctl nf_nat_sip disable
+ kmodule_ctl nf_conntrack_sip disable
+==Vigor2760==
+In the web interface, under Network > NAT, click the ALG tab then set the SIP ALG off
+==TP Link==
+telnet in to the router and:
+  ip nat service sip sw off
+If SIP ALG is disabled successfully, it will show Nat Sip v2 switch off! This will reset when rebooted and will need to be set again.
+==BT Business Hub==
+#Open a browser  go to 192.168.1.254
+#Click on ‘Advanced Settings’
+#Enter your admin password the default admin password can be found on the bottom of the router).
+#Click Continue to 'Advanced Settings'
+#Click Firewall then 'Configuration' and scroll down to 'Application Layer Gateway'
+#Click Yes next to 'Disable SIP ALG' and click Apply
+==ZyXEL 660 range==
+#telnet router
+#Menu option "24. System Maintenance".
+#Menu option "8. Command Interpreter Mode".
+#Type in:
+ ip nat service sip active 0
+==More info==
+*More info on: [http://www.voip-info.org/wiki/view/Routers+SIP+ALG VoIP-Info]
+[[Category:VoIP Faults]]