51  VoIP Subscriber Gateways 
 
To  add  rule  in  the  table,  click  ‘Save  changes’  button.  To  store  settings  into  the  non-volatile 
memory, click Apply button. 
The  changes  in  the  submenu  are  effective  immediately  after  clicking  ‘Apply  Changes’ 
button. Device reboot is not required. 
2.2.4 The ‘Static routes’ submenu 
Use the menu to set up static device routs and display current routing table. 
Routing table description: 
-  Destination – IP-address of destination network; 
-  Gateway – IP-address of gateway for connection to destination network; 
-  Genmask – subnet mask of destination network; 
-  Flags – route flag: 
  G – route uses a gateway; 
  U – route is active; 
  H—the destination is a separate host; 
  D—the route was created after receiving a redirected ICMP message; 
  M—the route was changed by a redirected ICMP message; 
  !—an inactive route, packets will be rejected; 
-  Metric – number of steps (hops)  to destination place; 
-  Ref – maximum number of data which the system will be able to receive in one packet 
from the remote computer; 
-  Detection (Use) – specify the value that is used for establishing a connection; 
-  Interface (Ifase) – network interface that the routs lie through.