How to Disable SIP ALG by Router Model

• Use the following command: no ip firewall alg sip

• Find ‘Options’ under ‘Advance’ and uncheck the SIP box.
• Apply the following credentials:
  • UN: admin
  • Password: motorola

• Find ‘Class inspection_default’ under ‘Policy-map global_policy’.
• Use the following command: no inspect sip

• Find ‘WAN/ NAT Passthrough’ under ‘Advanced Settings’
• Disable ‘Passthrough’.

• No option to disable SIP ALG.

• Find the SIP ALG feature under NAT or router firewall settings.

• Disable SIP ALG option is only available on BT Business Hub versions 3 and higher.

• Find SIP Fixup
• On General Routers, apply the following:
  • no ip nat service sip tcp port 5060
  • no ip nat service sip udp port 5060
• On Enterprise-Class Routers, apply the following:
  • no ip nat service sip tcp port 5060
  • no ip nat service sip udp port 5060
• On Pix Devices, apply the following:
  • no fixup protocol sip 5060
  • no fixup protocol sip udp 5060

• Find ‘Application Level Gateway (ALG) Configuration’ under ‘Advanced  settings’
• Uncheck the ‘SIP’ option.

• For Vigor2760 devices use the ALG feature Findd under Network/NAT.
• For other devices use a Telnet client.
• On Windows systems:
  • Find the Windows Start button.
  • Search for cmd: hit enter.
  • Type in telnet 192.168.1.1: hit enter.

(Note: Unless you have the Windows telnet client installed, you will need to do that now by locating the Telnet Client in the Windows Programs and Features, and turning it on.)

• Type in the username and the password in the credentials prompt.
• Apply the following commands:
  • sys sip_alg 0
  • sys commit
• For Draytek Vigor2750 and Vigor2130 devices apply the following commands:
  • kmodule_ctl nf_nat_sip disable
  • kmodule_ctl nf_conntrack_sip disable

• Use the following commands from the CLI interface:
  • config system session-helper
  • show system session-helper
• Find the SIP session instance, typically indicated by #12
• Delete #12 or the appropriate number
• Confirm deletion by re-running ‘show system session-helper’.

• Find SIP ALG in the Security menu.

• Go to the ‘Advanced’ section on the Admin page and disable the SIP ALG feature. This instruction can be used as a general Linksys router guidance.
• For Linksys BEFSR41 routers, go to ‘Port Triggering’ under ‘Applications and Gaming’ on the Admin page.
  • Type in ‘TCP’ as the application.
  • Type in ‘5060’ into the Start Port and End Port for the ‘Triggering Range’ and ‘Forwarded Range’ fields.
  • Tick ‘Enable’.
  • Save and Reboot.

• Disable SIP Helper.

• Find the advanced settings under Security/Firewall from the admin interface.
• Disable SIP ALG.
• Find Session Limit under Security/Firewall.
• Increase the UDP timeout to 300 sec.

• Locate the VoIP tab:
• Check ‘Enable Consistent NAT’
• Uncheck ‘Enable SIP Transformations’.

• Check in the user manual for a specific model to see if you need to use Telnet commands to disable SIP ALG.

• Use the Telnet client by typing cmd in the Windows Start menu.
• Apply the command: ip nat service sip sw off

• Go to ‘Options’ under ‘Advanced’.
• Uncheck the SIP option.
• Uncheck the RTSP option.
• Click Apply.

• SIP ALG cannot be disabled.

• Go to ALG, under Network/Configuration/Settings.
• Disable SIP ALG.