QoS for VOIP on FVS336Gv2|PROSAFE DUAL WAN GIGABIT firewall

Hello,

Would anyone be able to advise on setting up QoS for VOIP phones on the firewall?

On the firewall, I see there is a QoS section under Network configuration -> QoS.

There are predefined service types for SIP-TCP and SIP-UDP but I don't seem to be able to confirm if they are the proper ports (5060).

Also, I see no ports for RTP although not sure if these are of concerne and can probably be added in manually as a mual service,

In Qos type I get to choose between priority and rate control. Am not really familiar with rate control, my real concerne is really just prioritazing the VOIP traffic as top priority. If I select priority, most of the field get greyed out and I am left with choosing a Diffserv QoS Match (which indicates values DSCP 0 - 63), Diffserv QoS Remark (same values of  DSCP 0 - 63) and priority (only choices of high and low, so high obviously). Also when I have chosen the type as priority, I can only pick inbound or outbound traffic for the service, not both. 

Does that mean that I have to create 2 entries for each service? (2 for SIP-TCP (inbound and outbound) and same with SIP-UDP)?

In another area - Security-> Firewall, I see there is an options to assign a QoS profile to the rules.There only seems to be an option that says "High" (or "None"). 

I am also not certain if one needs to enable QoS in the area mentoned before (Network configuration -> QoS) at all or if QoS High riority can just be set up on individual rules.

Would be great if someone could shed some light into this.

Much appreciated