Poor audio and video quality when in conference

I have a customer with poor quality in audio/video conferences.
P2P is going really well, there are no problems with sharing desktops and applications until they try to share a powerpoint presentation OR invites a third participant. The behaviour is the same even if the two users are on different network sites with a
WAN between them. Perfect audio and video until sharing ppt or inviting third participant.
The environment is as follows
3 hardware front end servers, two edge servers, Office web apps farm with two servers. All web services are loadbalanced with BigIP. There is a cisco firewall between clients and servers. QoS is implemented on clients, edge and FE-servers. Latest CU on all
servers. approx 390 users now(pilot) should be approx 6500 when fully deployed. There is another pool with same setup, but we do not have users on that pool yet. Users do not have internet.All conversations going bad are classified as green in monitoring reports.
No extreme values in the reports. Clients are running no policies, all servers are default. Servers are flatlining. approx 20 video calls a day at this point e.g. there si more than enough capacity in the network and on the servers.
At this point I suspect either packet inspection on the cisco firewall OR some odd configuration needed on the Frontends. 
I have asked the network guys if there is a packet inspection being done on the firewall, and if there is done anythong to optimize this.
I have read about the conferencing policy but do not understand what maximum limits should have anything to do with it.
I am not sure where to start here.

Hi,
The media traffic bandwidth usage can be challenging to calculate because of the number of different variables, such as codec usage, resolution, and activity levels. The bandwidth usage is a function of the codec used and the activity
of the stream, both of which vary between scenarios. The following table lists the audio codecs commonly used in Lync Server 2013 scenarios.
You can refer to the link below of “Network bandwidth requirements for media traffic in Lync Server 2013” to check if the network bandwidth match the requirements (especially for conference
situation):
http://technet.microsoft.com/en-us/library/jj688118.aspx
Best Regards,
Eason Huang
Eason Huang
TechNet Community Support

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