SIP and RTP traffic priority

[complex1]

Hi,

I’m running 3CX v15.5 SP6 on a NUC with Debian 9.7 and I want to give SIP and RTP traffic priority.
To do so, I want to mark SIP traffic with DSCP 26 and Voice traffic (RTP) with DSCP 46.

I use this link as guide
https://www.3cx.com/blog/voip-howto/qos-linux/

I want to add the following rules in iptables

-A OUTPUT -p tcp -m tcp --sport 5060 -j DSCP --set-dscp 26
-A OUTPUT -p udp -m udp --sport 5060 -j DSCP --set-dscp 26
-A OUTPUT -p udp -m udp --sport 9000:10999 -j DSCP --set-dscp 46

Is this going to work or do it need some changes?

Any thoughts?

Thanks.

 

[cobaltit]

Should work but the only way to make sure is to do it and then wireshark and confirm