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Page Source for QoS

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=head2 QoS for VOIP 

Marking VOIP packets with DSCP allows you to implement a QoS policy on
your network. This will give SIP, RTP and IAX2 traffic a higher
priority. Marking packets is not enough for QoS to work. Your network
equipment (router, switch) needs to LOOK at the packets and honor the
markings. 

Here is a Linux iptables example which will mark VOIP traffic coming
from your softphone, Asterisk, FreeSWITCH or any other VOIP software
running at your computer. 

# mark IAX2 packets 

iptables -t mangle -A OUTPUT -p udp -m udp --sport 4569 -j DSCP
--set-dscp-class ef 

# mark SIP packets 

iptables -t mangle -A OUTPUT -p udp -m udp --sport 5060 -j DSCP
--set-dscp-class cs3 

# mark RTP packets, 10000-20000 port range 

iptables -t mangle -A OUTPUT -p udp -m udp --sport 10000:20000 -j DSCP
--set-dscp-class ef 

Packets passed through Diamondcard network are marked in the following
way: 

SIP signaling: set-dscp-class cs3 

RTP audio: set-dscp-class EF 

IAX2: set-dscp-class EF 

You may adjust your router setting to give such packets higher priority
and bandwidth. 

X<Asterisk IAX IAX2 SIP freeswitch qos tos> 

Tags for this page:   asterisk   freeswitch   iax   iax2   qos   sip   tos

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