Andrei Verovski (aka MacGuru) wrote: >I found an excellent article about QoS and traffic shaping for VoIP (Asterisk >IAX protocol), which is designed to improve sound quality even over very busy >lines. > >http://www.howtoforge.com/voip_qos_traffic_shaping_iproute2_asterisk
Actually I disagree that it's excellent - it really doesn't cover all the issues, and in particular it does not address inbound congestion which is equally (if not more) important. I suggest you look at : http://lartc.org/howto/lartc.cookbook.ultimate-tc.html >The Ultimate Traffic Conditioner: Low Latency, Fast Up & Downloads and http://www.shorewall.net/traffic_shaping.htm#Wondershaper >Configuration to replace Wondershaper I setup a gateway at work using the latter config, and it really does work very nicely ! >Should I just cut and paste all that to shorewall's tcrules (replacing 4569 >with 5060)? No, see the above for the other bits you need. Also, it isn't the SIP stuff on port 5060 that you need to worry about (though it is important). You need to prioritise the RTP stuff which is on various UDP ports (different by manufacturer and config). The default for Asterisk is to use the whole range from 10001 to 20000 ! >Additionally, author of this article uses IAX protocol, but today's standard >is SIP, which uses: >For SIP Messaging Protocol: TCP/UDP port 5060 >For RTP Protocol: UDP port range 5061-5161 (might be different, depending on >setup) IAX2 is in many ways better than SIP, but less widely supported. SIP is a REAL P.I.T.A. when NAT is involved (ie most setups), and I really do mean a major PITA ! IAX2 is not a problem and you just the appropriate port forwarding/accept rules. And no, there is absolutely NO single way to make SIP work properly with NAT. There are many ways that work for some situations, but no universal solution. I've set up Asterisk boxes both with SIP trunks and IAX2 trunks - IAX2 is FAR easier to setup & configure. But for your endpoints you will almost certainly be using SIP since few devices support IAX2. ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Shorewall-users mailing list Shorewall-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/shorewall-users
