legend

SC

session

characteris’n

P

policy

$

chargerecord

C

context

information

(hard state)

message

state & interface

R

resource

M

mgmt =

any of

Q

query

OA

offeracceptance

O

offer

AA

addressallocation

QA

QoS policyassociation

A

association

= any of

Iq

QoS

signalling

Ip

data packet

I

service invocation

= either of

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