Quality of Service (QoS) is determined by DSCP markings in layer 3 of IP packets. Properly configured routers will use those DSCP markings to give priority to those packets. That is advantageous for SIP signalling and RTP (media packets), because if media packets are not given priority, then the media quality can suffer if there is congestion at the router with other data traffic. By giving priority to VoIP packets, the packets should not suffer from excessive delay, provided the end to end network supports QoS.
In enterprise editions of Windows 7 & 8, the group policy editor can be used to set QoS for specific applications such as Bria 4. Please note that the Domain controller in corporate networks may override local group policies. You should consult with your IT administrator to work out the details if your computer is on a domain.
Please refer to the following screenshots.
1) Launch the local group policy editor
Start > Run > gpedit.msc (this starts the local group policy editor, domain level policy will override these settings)
Expand Computer Configuration > Windows Settings
Right click on Policy Based QoS > Create new policy ...
2) Create the Voice policy
DSCP = 46
Application name = Bria4.exe
IP address source/destination = any
Protocol = UDP
Source/destination port = any
3) Set the QoS policy for Bria4.exe
4) Set the source and destination IP address to "Any"
5) Set the source and destination ports to "Any"
6) Bria 4 marks RTP packets with QoS tag DSCP 46 when the policy is active
7) Additional QoS policies can be added for video and SIP signalling control with appropriate DSCP values and port ranges
8) The Bria 4 Account settings|Topology tab can be used to set the corresponding port ranges that Bria will send the SIP (Control) and RTP (Voice and Video) packets out on.
If the same port ranges are chosen as the QoS policy, then the packets will be marked with the corresponding DSCP values defined.