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autonumber
skinparam {
    dpi 300
    shadowing false
    'handwritten true
    defaultFontSize 8
}

skinparam note {
    FontSize 8
    FontStyle bold
    FontColor White
    borderColor Black
    backgroundColor DimGray
}

skinparam participant {
    FontSize 8
    FontStyle bold
    FontColor White
    borderColor Navy
    backgroundColor RoyalBlue
}

skinparam actor {
    FontSize 8
    FontStyle bold
    FontColor Navy
    borderColor Navy
    backgroundColor RoyalBlue
}

skinparam sequence {
    ArrowFontColor Black
    ArrowColor SlateGray
    LifeLineBorderColor Navy
    LifeLineBackgroundColor DimGray
}

skinparam ParticipantPadding 5
skinparam BoxPadding 5

!define sendrcvRTP(a,b,c) a <-[#LimeGreen]> b : c
!define sendRTP(a,b,c) a -[#LimeGreen]> b : c
!define setParticipant(a,b) participant a as b