public TelephoneExchange(ICollection<Port> ports, ICollection<ClientTerminal> terminals)
{
_terminalToPertConnections = new List<TerminalToPortConnection>();
CurrentSessions = new List<Session>();
Rates = new List<IRate>();
BillingSystem = new BillingSystem();
Ports = ports;
Terminals = terminals;
}
public TelephoneExchange()
{
_terminalToPertConnections = new List<TerminalToPortConnection>();
CurrentSessions = new List<Session>();
Rates = new List<IRate>();
BillingSystem = new BillingSystem();
Ports = new List<Port>();
Terminals = new List<ClientTerminal>();
}