ua.go incorrectly assumes that a received invite is a reinvite. about go-sip-ua HOT 4 CLOSED

callID, ok := request.CallID()
if ok {
	var transaction sip.Transaction = tx.(sip.Transaction)
	v, found := ua.iss.Load(*callID)
	if request.To().Params().Has("tag") {
		if found {
			is := v.(*session.Session)
			is.SetState(session.ReInviteReceived)
			ua.handleInviteState(is, &request, nil, session.ReInviteReceived, &transaction)
		} else {
			// some equivalent to: is.Reject(sip.StatusCode(481), "Call/Transaction does not exist")
		}
	} else {
		contact, _ := request.Contact()
		is := session.NewInviteSession(ua.RequestWithContext, "UAS", contact, request, *callID, transaction, session.Incoming, ua.Log())
		ua.iss.Store(*callID, is)
		is.SetState(session.InviteReceived)
		ua.handleInviteState(is, &request, nil, session.InviteReceived, &transaction)
		is.SetState(session.WaitingForAnswer)
	}
}