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@startuml "TD_VoLTE_ECO_INT_INI_07.png"
!include etsi-style.iuml
!pragma teoz true
'
'Figure: Emergency Session Establishment, PSAP in the PSTN
'
''title Figure : Emergency Session Establishment, PSAP in the PSTN
'
participant "UE A"
box "EPC A" #LightBlue
participant PGw
participant "PCRF"
end box
box "IMS A" #LightBlue
participant "P-CSCF"
participant "E-CSCF"
participant "BGCF"
end box
participant "PSAP"
rnote right "UE A" : Gm
& rnote right "P-CSCF" : Mw
& rnote right "E-CSCF" : Mi
& rnote right "PCRF" : Rx
& rnote right "PGw" : Gx
'
"UE A" -> "P-CSCF" : INVITE
"P-CSCF" -> "PCRF" : AAR
rnote over "PCRF", PGw #FFAAAA: Policy decision
"PCRF" -> "PGw" : RAR
rnote over "PCRF", PGw #FFAAAA: Installation of the Session Bearer
"PGw" -> "PCRF" : RAA
& "PCRF" -> "P-CSCF" : AAA
"PGw" -> "PCRF" : CCR
& "PCRF" -> "P-CSCF" : RAR
"P-CSCF" -> "PCRF" : RAA
& "PCRF" -> "PGw" : CCA
& "P-CSCF" -> "E-CSCF" : INVITE
rnote over "E-CSCF", PSAP #FFAAAA: PSAP in PSTN
"E-CSCF" -> "BGCF" : INVITE
& "BGCF" -> "PSAP" : INVITE
"PSAP" -> "BGCF" : 183 Session Progress\n(SDP answer)
& "BGCF" -> "E-CSCF" : 183 Session Progress\n(SDP answer)
& "E-CSCF" -> "P-CSCF" : 183 Session Progress\n(SDP answer)
& "P-CSCF" -> "PCRF" : AAR
& "PCRF" -> "PGw" : RAR
rnote over "PCRF", PGw #FFAAAA: Modification of the Session Bearer
"PGw" -> "PCRF" : RAA
& "PCRF" -> "P-CSCF" : AAA
"P-CSCF" -> "UE A" : 183 Session Progress\n(SDP answer)
"UE A" <--> "PSAP" : Early Media
"PSAP" -> "BGCF" : 180 Ringing
& "BGCF" -> "E-CSCF" : 180 Ringing
& "E-CSCF" -> "P-CSCF" : 180 Ringing
&"P-CSCF" -> "UE A" : 180 Ringing
"PSAP" -> "BGCF" : 200 OK
& "BGCF" -> "E-CSCF" : 200 OK
& "E-CSCF" -> "P-CSCF" : 200 OK
& "P-CSCF" -> "UE A" : 200 OK
"UE A" -> "P-CSCF" : ACK
& "P-CSCF" -> "E-CSCF" : ACK
& "E-CSCF" -> "BGCF" : ACK
& "BGCF" -> "PSAP" : ACK
"UE A" <--> "PSAP" : Media Exchange
@enduml