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https://www.gigamon.com/products/optimize-traffic/subscriber-intelligence/sip-rtp-correlation.html

VoIP Subscriber- and User-Aware Forwarding

It just got easier — and more efficient — to monitor voice- and video-over-IP (VOIP) sessions carried in Real-Time Transport Protocol (RTP) and managed by Session Initiation Protocol (SIP) signaling. It’s called the SIP/RTP Correlation application, and is a licensable and intelligent addition to the GigaSMART® engine that enables enterprises and service providers to monitor VoIP traffic.

Because it understands the stateful nature of the SIP protocol, the SIP/RTP Correlation application can match and pass an identified user’s SIP signaling and RTP media sessions to the appropriate analytics, performance and security subsystems. That’s a big help ensuring an accurate view of the session performance, the user’s quality of experience and secureness of the communication.

With the SIP/RTP Correlation application, service providers and enterprises can now intelligently forward VoIP sessions to specific tools by filtering on ranges of or specific user IDs, sampling just a percentage of media sessions and/or balancing the aggregate SIP and RTP sessions.

Benefits of the SIP/RTP Correlation Application:

• More efficient, effective tool processing throughput
• Improved analytics accuracy from reliable correlation of user sessions
• Enables improved user experiences and service monetization with more accurate end-user quality of experience metrics
• More reliable accounting, billing and subscription management
• Fewer errors through accurate correlation of subscriber or user data fragmented in transit

Take advantage of our new bundled GigaSMART apps to be subscriber-aware!

Fortigate SIP ALG / Fortinet SIP ALG

FortiOS has two features that can modify the SIP headers and SDP parameters. The first feature is called the “SIP Session Helper”. If you are experiencing one way audio issues disable this feature first, reboot your IP phone then try making another call. If disabling the session helper does not work, disable the SIP ALG as well.

To disable the sip session helper:

1 Enter the following command to find the sip session helper entry in the session-helper list:

show system session-helper

edit 10
set name sip
set port 5060
set protocol 17

2 Enter the following command to delete session-helper list entry number 10 to disable the sip session helper:

config system session-helper
delete 10

To disable the SIP ALG:

There are typically two VOIP profiles on a factory shipped Fortinet firewall. You may need to disable both profiles to fully stop the ALG.

config voip profile
edit VoIP_Pro_2
config sip
set status disable
end
end

See the Fortigate Technical documentation page for further details.

Fortigate SIP ALG / Fortinet SIP ALG

FortiOS has two features that can modify the SIP headers and SDP parameters. The first feature is called the “SIP Session Helper”. If you are experiencing one way audio issues disable this feature first, reboot your IP phone then try making another call. If disabling the session helper does not work, disable the SIP ALG as well.

To disable the sip session helper:

1 Enter the following command to find the sip session helper entry in the session-helper list:

show system session-helper

edit 10
 set name sip
 set port 5060
 set protocol 17

2 Enter the following command to delete session-helper list entry number 10 to disable the sip session helper:

config system session-helper
 delete 10

To disable the SIP ALG:

There are typically two VOIP profiles on a factory shipped Fortinet firewall. You may need to disable both profiles to fully stop the ALG.

config voip profile
 edit VoIP_Pro_2
 config sip
 set status disable
 end
 end

See the Fortigate Technical documentation page  for further details.