Questions for QoS on switches

Hello Experts,
I currently have QoS settings on my switch:
class-map match-any VOIP
match dscp cs5
match dscp ef
class-map match-all VIDEO_Conference
match dscp af41
class-map match-all ROUTING
match dscp cs6
policy-map myLAN
class VOIP
set dscp ef
class VIDEO_Conference
set dscp af41
class ROUTING
set dscp cs6
interface g1/1
ip address 10.10.12.1 255.255.255.0
ip pim sparse-mode
service-policy input myLAN
service-policy output myLAN
I understand that the class-map is for defining the traffic and policy-map is for creating policy for the map traffic. But still confusing the ways they're working.
For this example:
class-map match-any VOIP
match dscp cs5
match dscp ef
How do i know that VOIP packet is cs5/ef? are there any predefined info for VOIP packets? what are cs5 and ef really playing the roles here?
Thanks.

Hi,
Thanks for the reply, for this CS5 again:
class-map match-any VOIP
match dscp cs5
match dscp ef
I've checked from my switch:
Switch(config-cmap)#match dscp ?
<0-63> Differentiated services codepoint value
af11 Match packets with AF11 dscp (001010)
af12 Match packets with AF12 dscp (001100)
af13 Match packets with AF13 dscp (001110)
af21 Match packets with AF21 dscp (010010)
af22 Match packets with AF22 dscp (010100)
af23 Match packets with AF23 dscp (010110)
af31 Match packets with AF31 dscp (011010)
af32 Match packets with AF32 dscp (011100)
af33 Match packets with AF33 dscp (011110)
af41 Match packets with AF41 dscp (100010)
af42 Match packets with AF42 dscp (100100)
af43 Match packets with AF43 dscp (100110)
cs1 Match packets with CS1(precedence 1) dscp (001000)
cs2 Match packets with CS2(precedence 2) dscp (010000)
cs3 Match packets with CS3(precedence 3) dscp (011000)
cs4 Match packets with CS4(precedence 4) dscp (100000)
cs5 Match packets with CS5(precedence 5) dscp (101000)
cs6 Match packets with CS6(precedence 6) dscp (110000)
cs7 Match packets with CS7(precedence 7) dscp (111000)
default Match packets with default dscp (000000)
ef Match packets with EF dscp (101110)
when it says 'cs5 Match packets with CS5(precedence 5) dscp (101000)', does that mean the network packet's binary has to match this binary 101000 to able to define it as cs5?
I need to wrap my head around this QoS since i've been having a serious confusion about this QoS things. How would you explain this below in our language?
class-map match-any VOIP
match dscp cs5
match dscp ef
policy-map myLAN
class VOIP
set dscp ef
interface g1/1
ip address 10.10.12.1 255.255.255.0
ip pim sparse-mode
service-policy input myLAN
service-policy output myLAN
Thanks a lot!

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