Almost all companies currently use IP-telephony, both commercial and budget. And some organizations are trying to organize PBXs on their servers. They simply buy numbers and lines from the numbering capacity of IP-telephony providers, and they lift a virtual PBX on their server through the console Asterisk or with an interface, for example, FreePBX (the most common), or buy an “iron exchange”, for example, Panasonic TDE.
, , , . IP-, , Asterisk, FreePBX Panasonic. , . , , , , - .
, ? .
.
, Panasonic FreePBX, .
.
, — , , IP- , .
, , , . , , 3 : “” Asterisk, FreePBX “” Panasonic.
. .
- sip
, , “” .
3- , , , , , , .
( ). - , , IP-.
IP- , .
, :
?
, . . . , , . , , , IP-.
, “”, .
IP- Asterisk .
IP-, , sip , .
, Insecure.
NATa, ip-. , , sip .
NATa.
, voip .
, .
.
, , .
, , .
, sip . voip .
, voip .
, , .
, .
.
.
, 5 . , .
, VPN. , VPN , OpenVPN. , , , .
VPN , , .
To ensure network security, the well-known Fail2ban mechanism is used.
Fail2ban allows you to protect telephony, mail server, webmail, VPN, FTP and SSH by blocking (for a given time or permanently) IP addresses from which too many authorization attempts are made.
The license for ICS is unlimited, plus there is its own technical support.
The only negative is that while you can not buy modules separately.
But most likely, this will not be a minus for everyone, since now more and more organizations are paying much attention to network security and are trying to control the access to various resources of their employees.