Disable SIP ALG on the SonicWALL

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 https://www.sonicwall.com/support/knowledge-base/how-to-disable-sip-alg/210615065648977/


How to Disable SIP ALG on the SonicWALL

SIP ALG : SIP ALG (Application Layer Gateway) is a mechanism found in most routers that rewrites packets transmitted across the device. Certain protocols are processed by the application layer gateway (ALG) and rewritten to allow better flow through a firewall or when NAT (Network Address Translation) is employed. The SIP protocol is one of several protocols managed by this system.

One of the most common issues with VoIP solutions relates to audio transmission and presence of a firewall and/or NAT traversal being configured. In many cases, a properly configured system may still have audio issues when transmitting or receiving calls where only one party is heard during a call. Implementing the necessary changes to disable 

Here's how you can disable SIP ALG:

  1. Navigate to MANAGE | VoIP
  2. Click on VoIP
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  3. Enable the Check-box, Enable consistent NAT.
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     NOTE: Consistent NAT enhances standard NAT policy to provide greater compatibility with peer-to-peer applications that require a consistent IP address to connect to, such as VoIP. Consistent NAT uses an MD5 hashing method to consistently assign the same mapped public IP address and UDP Port pair to each internal private IP address and port pair.     
     CAUTION: Enabling Consistent NAT causes a slight decrease in overall security, because of the increased predictability of the address and port pairs. 

  4. Disable the check box, Enable SIP Transformations.
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    Optionally, Change the UDP timeout on the LAN to WAN Access rule.

  5. Go to the Advanced tab of LAN to WAN Access rule, and change the UDP timeout from default 30 seconds to 120 seconds.

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SIP ALG can oftentimes resolve these issues.


How do I turn off SIP ALG?

To disable SIP ALG, you will need to log into your router. Your router can also function as a modem for some broadband gateways. Popular brands of routers include Cisco, Linksys, Netgear, D-Link, Asus, and TP-Link.

We've compiled a list of the top routers and included links to disable the Application Layer Gateway, which can interfere with VoIP calls.

In most cases, you will need to sign in to your router with the admin password. Look under its security settings, uncheck SIP ALG, save and reboot your router. More advanced corporate firewalls may require further adjustment, such as port forwarding.

Router ManufacturerSteps to Disable SIP ALG
Actiontec
  1. Select Advanced, click Yes to accept the warning, then click ALG’s.
  2. Ensure SIP ALG is disabled by removing the check.
  3. Click Apply.
  4. Select Advanced, click Yes to accept the warning, then click Remote Administration.
  5. Click the checkbox to Allow Incoming WAN ICMP Echo Requests (for traceroute and ping), then click Apply.
  6. For more info, check out this support article.
Adtran
  1. Under Firewall, go to Firewall / ACLs.
  2. Click on ALG Settings.
  3. Uncheck the box labeled SIP ALG
  4. Click Apply.

If you are using the terminal, issue the following command:
no ip firewall alg sip

ArrisMost Arris broadband gateways:

  1. Navigate to the gateway’s IP (192.168.0.1).
    Username: admin Password: motorola
  2. Navigate to Advanced, then Options.
  3. Uncheck the SIP box.
  4. Click Apply.

Arris BGW210

  1. Navigate to 192.168.1.254.
    Authenticate without a username, and use the password located on the unit’s sticker.
  2. Under the Firewall section, click on Advanced Firewall.
  3. Change the Set SIP ALG setting to off.
  4. Turn off the Authentication Header Forwarding.
  5. Turn off ESP Header Forwarding.
  6. Click Save.
Asus
  1. Under the Advanced Settings section, click WAN.
  2. Click the NAT Passthrough tab.
  3. Change the SIP Passthrough setting to “Disable.”
  4. Click Apply.
AT&T

U-Verse Pace 5268AC Gateway
This broadband gateway does not support disabling SIP ALG. We recommend configuring your gateway to function only as a modem, not a router (Bridge Mode). You will need to use another router that supports disabling SIP ALG.

Cisco

Cisco General and Enterprise-Class routers:
no ip nat service sip tcp port 5060
no ip nat service sip udp port 5060

Cisco PIX routers:
no fixup protocol sip 5060
no fixup protocol sip udp 5060

Cisco ASA routers:
Locate ‘Class inspection_default’ under ‘Policy-map global_policy’. Execute this command: no inspect sip

D-Link
  1. Click on Advanced Settings.
  2. Locate the Application Level Gateway (ALG) Configuration.
  3. Uncheck the SIP option.
  4. Click Save.

DIR-655:

  1. Click Advanced, located along the top.
  2. Click Firewall Settings on the left side of the screen.
  3. Uncheck Enable SPI
  4. Set both UDP and TCP Endpoint Filtering to Endpoint Independent.
  5. Uncheck SIP from Application Level Gateway Configuration.
  6. Click Save.
Fortinet
  1. Use the following commands from the CLI interface:
    config system session-helper
    show system session-helper
  2. Find the SIP session instance, typically indicated by #12
  3. Delete #12 or the appropriate number
  4. Confirm its deletion by executing this command:
    show system session-helper. For more guidance, follow this article.
Linksys

Linksys Smart Wi-Fi (E-series):

  1. On the left side of the screen, click on Connectivity.
  2. Click the Administration tab.
  3. Under Application Layer Gateway, verify SIP is unchecked.
  4. Click Apply or Save.

Older Linksys models:

  1. Go to the ‘Advanced’ section on the Admin page
  2. Disable the SIP ALG feature.

Linksys BEFSR41 routers:

  1. Click on Applications and Gaming on the Admin page.
  2. Click on Port Triggering. 
  3. Type in ‘TCP’ as the application.
  4. Type in ‘5060’ into the Start Port and End Port for the ‘Triggering Range’ and ‘Forwarded Range’ fields.
  5. Check ‘Enable’.
  6. Click on Save and Reboot.
MikrotikFor Mikrotik routers, SIP ALG is known as SIP Helper.

  1. Use the company’s winbox software.
  2. Navigate to IP, then Firewall.
  3. Click on the Service Ports tab and disable it through the GUI.
  4. You may also run this command from the terminal:
    /ip firewall service-port disable sip
Netgear

For Netgear routers with the Genie interface:

  1. Select the Advanced tab at the top.
  2. Expand the Setup menu on the left side of the screen.
  3. Click WAN Setup.
  4. Check the box labeled Disable SIP ALG.

Other Netgear routers:

  1. Under the Security/Firewall, click on Advanced Settings.
  2. Disable SIP ALG.
  3. Locate Session Limit under Security/Firewall.
  4. Increase the UDP timeout to 300 sec.
SonicWall
  1. Under System Setup on the left side of the screen, click on VoIP.
  2. Check ‘Enable Consistent NAT’
  3. Uncheck ‘Enable SIP Transformations’.
  4. Click Accept.
  5. To increase UDP timeouts, navigate to the Firewall Settings, then Flood Protection.
  6. Click on the UDP tab and modify the default UDP connection timeout to 300 seconds.
  7. Click the Accept button to save the changes. For more information, consult this support article.
TP-Link

Newer TP-Link routers (Archer series):

  1. Click on the Advanced Tab.
  2. Expand the NAT Forwarding menu on the left side of the screen.
  3. Uncheck SIP ALG, RTSP ALG, and H323 ALG checkboxes.
  4. Click Save.

Older TP-Link routers:

  1. Use the Telnet client from the Command Prompt.
  2. Apply the following command:
    ip nat service sip sw off
UBEE
  1. Go to Advanced, then Options.
  2. Uncheck the SIP and the RTSP checkboxes.
  3. Click Apply.
Ubiquiti

UniFi Security Gateway

  1. Sign in to your UniFi security gateway.
  2. Click on Routing & Firewall along the left side.
  3. Click the Firewall tab at the top and click Settings from the sub-menu.
  4. Toggle H.323 and SIP to off.
  5. Click the Apply Changes button.

EdgeRouters (ER-x)

  1. Access the router’s administrative interface, typically at 192.168.1.1.
  2. Use the Config Tree or a command-line interface to disable SIP ALG.

Config Tree:

  1. Select config tree in the top right-hand corner.
  2. Expand system, conntrack, modules, and sip.
  3. Click the plus sign next to disable.
  4. Click the Preview option.
  5. Click Apply.

Command Line Interface:

  1. From the administrative interface, choose CLI located at the top right corner of the screen.
  2. From here, we can also increase UDP timeouts as well.
  3. Enter these commands into the terminal:
    configure
    set system conntrack modules sip disable
    set system conntrack timeout udp stream 300
    set system conntrack timeout udp other 300
    commit
    save
    exit
Verizon FiOS

G1100

This broadband gateway does not support disabling SIP ALG. We recommend configuring your gateway to function only as a modem, not a router. You will need to use another router that supports disabling SIP ALG.

ZyXEL

ZyXEL ZyWALL/USG60:

  1. Click on Configuration and expand the Network settings.
  2. Click ALG along the left side.
  3. Uncheck all the checkboxes on the right side:
    1. Uncheck Enable SIP ALG.
    2. Uncheck Enable SIP Transformations.
  4. Click Apply.
  5. For more information, consult this help article.

ZyXEL C1000Z/C1100Z (CenturyLink):

  1. Click on Advanced Setup.
  2. Click on SIP ALG along the left side.
  3. Toggle the SIP ALG setting to Disable.
  4. Click Apply.

ZyXEL P600:

  1. Telnet to the router (192.168.1.1) and enter the password.
  2. The default password is 1234. Type “24” and press enter.
  3. Then “8” and press enter.
  4. Provide this command:
    ip nat service sip active 0
  5. When done, press Enter.


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