@startuml
!include skin.inc

autonumber "#'.'"

participant "Server" as srv 
participant "Application" as app 
participant "<i>Browser</i>" as bro #ffffff

note left of srv: Receive session invitation \nwithout offer
srv -> app: POST or NOTIFY VvoipSessionInvitationNotification(sessionId)

app -->> bro: <i>Create PeerConnection and set up media sources</i>
app -->> bro: <i>offerSdp1=peerConnection.CreateOffer()</i>
app -->> bro: <i>peerConnection.SetLocalDescription(offer, offerSdp1)</i>

app -> srv: PUT VvoipOffer(offer, offerSdp1)
srv --> app: Response
note left of srv: Send offer reliably \nand wait for answer 


srv -> app: POST or NOTIFY\nVvoipAnswerNotification(answer, answerSdp1)
app -->> bro: <i>peerConnection.SetRemoteDescription(answer, answerSdp1)</i>

note over bro, srv
 Running ICE connectivity checks
end note
bro -->> app: <i>oniceconnectionstatechange(connected)</i>
app -> srv: PUT VvoipIceStatus(Connected)
srv --> app: Response

app -> srv: PUT VvoipSessionStatus(Ringing)
srv --> app: Response

note left of srv: Send ringing indication
app -->> app: <i>Alert the user</i>
note right of app: User accepts
app -> srv: PUT VvoipSessionStatus(Connected)
srv --> app: Response

note left of srv: Send acceptance indication
note over bro, srv
 Originator and Terminating Participant are in a call now.
end note

@enduml