41  VoIP Subscriber Gateways 
 
2.2.2 The ‘IPSec’ submenu 
In this submenu, you may configure IPSec encryption (IP Security). IPSec is a set of protocols 
used  for  protection  of  data  transmitted  via  Internet Protocol  that  enables  authentication,  integrity 
check and/or encryption of IP packets. IPsec also includes secure Internet Key Exchange protocols. 
 
IPSec settings:  
-  IPSec enable  IPSec enable – permit to use IPSec protocol for data encryption; 
-  Name of service – service selection where encryption via IPSec protocol will be used; 
-  Local IP address – the device address for operation via IPSec protocol; 
-  Local  subnet  in  cooperation  with  Local  netmask  determine  local  subnet  for  creation 
network-to-network or network-to-point topology; 
-  Remote  subnet  in  cooperation  with  Remote  netmask  determine  address  of  remote 
subnet  for  connection  with  using  encryption  via  IPSec  protocol.  If  the  mask  value  is 
255.255.255.255, communication is performed with a single host. Mask that differs from 
255.255.255.255 allows defining a whole subnet. Thus, functionality of the device allows