Hi everyone!

I want to implement a simple QoS between two devices (PBX). These PBXs already tag important packets correctly with DSCP 46.

Goals:
- Simple configuration, obey standards
- Reserve minimal bandwidth (2M) on link between Switches, allow growth up to 10M.
- Follow guidelines of https://tools.ietf.org/html/rfc4594#section-4.1
   The fundamental service offered to "Telephony" traffic is enhanced
   best-effort service with controlled rate, very low delay, and very
   low loss.  The service MUST be engineered so that EF marked packet
   flows have sufficient bandwidth in the network to provide guaranteed
   delivery.  Normally traffic in this service class does not respond
   dynamically to packet loss.  As such, Active Queue Management
   [RFC2309] SHOULD NOT be applied to EF marked packet flows.

Situation: (RI -> Routed Interface)

PBX - Switch(RI) - Switch(RI) - PBX

Is this correct:
1. I have to define an ACL containing the two PBXs IP adresses like this-> rule 5 permit ip source 192.168.135.20 0 destination 192.168.98.15 0
2. Then, I have to create a traffic CLASSIFIER like this -> if-match acl
3. Then, I have to create a traffic BEHAVIOR like this -> car cir 2000 pir 10000 cbs 250000 pbs 1250000 green pass yellow pass red discard
statistic enable
4. Then, I set a traffic POLICY like this -> classifier AND behavior
5. I apply this POLICY to all RI OUTGOING.
6. I trust dscp on the PBXs GE ports.

Here are my questions:
Do I have to disable Active Queue Management? Where?
Do I miss some important thing?