@startuml

[*] --> PendingConnection
PendingConnection --> PendingInvite
PendingConnection --> PendingConnection : RETRY
PendingConnection --> Failed
PendingInvite --> PendingAnswer
PendingInvite --> Failed
PendingAnswer --> PendingAccept
PendingAnswer --> Failed
PendingAccept --> PendingAcceptAck
PendingAccept --> Failed
PendingAcceptAck --> Talking
PendingAcceptAck --> Failed
Talking --> PendingRemoteHangup
Talking --> PendingLocalHangup
Talking --> PendingReconnect
PendingReconnect --> Talking
PendingReconnect --> Failed
PendingRemoteHangup --> Disconnected
PendingLocalHangup --> Disconnected

@enduml