How To Prioritise Outgoing Voip Traffic From The Branch Office 1 Router - Allied Telesis AlliedWare AR440S How To Configure

How to prioritise outgoing VoIP traffic from the branch
office 1 router
Add the following steps after
1. Create classifiers
In this example, the originating VoIP appliance has marked VoIP traffic and VoIP signalling
packets with DSCP 48.
2. Reduce the MTU
VoIP data packets are small. They can be significantly delayed by big packets on the WAN
port, especially on slow links. Therefore, you may find it helpful to reduce the MTU for all
packets on the WAN port, for example, to 256 bytes.
You also need to make sure that all large packets are fragmented, even if they were
previously set to not be fragmented.
3. Set up software QoS to ensure VoIP traffic has high priority
Enable software QoS (SQoS), create an SQoS traffic class, and define a small queue size.
Create an SQoS policy, assign the traffic class to this policy, and define a suitable virtual
bandwidth for the interface being used.
4. For the site-to-site VPN, apply the SQoS policy to the tunnel
Apply the policy to the VPN between branch office 1 and headquarters.
Page 33 | AlliedWare™ OS How To Note: VPNs for Corporate Networks
step 11 on page
create classifier=48 ipds=48
set int=ppp0 mtu=256
set int=ppp0 frag=yes
ena sqos
cre sqos tr=1 prio=15 maxq=10
cre sqos policy=1 virt=120kbps
add sqos policy=1 tr=1
add sqos tr=1 classifier=48
set sqos interface=ipsec-hq tunnelpolicy=1
22.