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How to introduce Medianet into the environment

I've been doing a lot of researching regarding medianet.  I would like to entertain introducing a small footprint in the environment, but need a few questions answered.

1.  Do Cisco phones have MSI installed in order to be media net announcers/flow producers?  If so, what models and firmware versions if applicable?

2. Can media net be enabled and used for QoS on an access switch for an initial implementation with no upstream speakers? So, use medianet on the access switch and just pass along the QoS markings to the upstream distribution switch to fall in line with existing enterprise QoS policy.

3. Taking an access port for example. With medianet enabled on the access port, can you apply an ingress policy that has a medianet class or am I totally missing the point? Example config below.

!
class-map match-any MEDIA-CONTROL
match application cisco-phone signaling-type sip
match application cisco-phone signaling-type h323
match application cisco-phone signaling-type skinny
match application cisco-phone signaling-type mgcp
!
class-map match-any MEDIA-PAYLOAD
match application cisco-phone transport-type rtp
!

policy-map INBOUND-MARKING
class MEDIA-PAYLOAD
 set dscp ef
class MEDIA-CONTROL
 set dscp af31
class class-default
 set dscp 0

!

interface gi1/1

  metadata flow

  service-policy input INBOUND-MARKING

  

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