Disable SIP ALG -- Fortinet / Fortigate Print

  • 0

 

Regarding SIP ALG

Almost all routers include a feature called SIP ALG, and are delivered with this feature enabled by default.

An Application Layer Gateway, or ALG, could help in solving NAT related problems, but in our experience, most ALG implementations are wrong and break SIP.

Leaving SIP ALG enabled not only breaks SIP functionality, but can also impact the RTP audio stream resulting in one-way audio where you can hear the caller, but they can't hear you, or vice versa.

You should disable SIP ALG and configure either port triggering or one-to-one port mapping on the router as appropriate.

 

Open the Fortigate CLI from the dashboard and enter the following commands:

  • config system settings
  • set sip-helper disable
  • set sip-nat-trace disable
  • reboot the device

Re-open the CLI and enter the following commands:

  • config system session-helper
  • show    (locate the SIP entry, usually 12, but can vary)
  • delete 12    (or the number that you identified from the previous command)

Disable RTP processing as follows:

  • config voip profile
  • edit default
  • config sip
  • set rtp disable

 

There may be other settings that need to be configured depending on the FortiOS version you're using.

If you experience ongoing issues related to SIP ALG, contact Fortinet Support.

 

 


Was this answer helpful?

« Back

SERVICES

exchangeserver  hosted microsoft exchange
voipserver  enterprise-grade hosted PBX
cloudsms  2-way cloud SMS
broadbandconnect  NBN, wireless or fibre ethernet
Microsoft 365  licensing made easy
hostingserver  enterprise web hosting
sslcerts  trusted ssl certificates
domainnames  your name in the cloud
ezyreseller  our services, your clients


CONNECT

ezyreseller | powered by Digital Hybrid
PO Box 7208, South Penrith, NSW, 2750


SALES & ENQUIRIES

Call   1300 882 942
SMS   0409 19 88 66


COPYRIGHT © 2009 -       Digital Hybrid Pty Ltd | really communicate       ACN 139 660 585   |   ABN 37 139 660 585   |   ALL RIGHTS RESERVED WORLDWIDE