Smooth skype voice

[hillol]

Dear all
I am using tow pfsense for my routing solutions,
1: pf.mydomain.com , it has three interface, tow WAN ( Public IP) and one LAN( 192.168.1.0/24). This machine has three Load Balancer: Pool,
.  LoadBalance
. WANFailsToWAN2
. WAN2FailsToWAN
2. pf3.mydomain.com. it has two interface , one for WAN ( 192.168.1.4) which is connected with my pf.mydomain.com LAN interface. And another LAN (192.168.10.0/24) for my local clients.

Both pfs are running traffic shaper.
My question is, how can I get smooth skype voice through my pfs gateway?

Thank you all.
Hillol