3 Security Applied in VOIP
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For the security of using VoIP, implementing a security system is very important. For this reason, on this occasion, we will discuss the security system that can be applied in VoIP. For more details, let's just take a look at the following discussion
- VoIP Call Private Network
The first security system is the VoIP Call Private Network. Sometimes we can hear clearly when our friends are talking on traditional phones if they are in the same room. So from there, we can conclude the need for call privacy. VoIP is a packet technology that resembles a data packet as in LAN and WAN. To solve this problem, the easiest method is to route voice traffic over with a private network. When leveraging the power of public Internet routers the company uses an IPSec VPN to authenticate from sniffers. It is very possible to intercept voice traffic via the internet itself, but it is quite difficult, the capture can be done in VoIP by installing a radio shack. Then the attacker will easily intercept the VoIP call and decode it. A network administrator must have resources in terms of protection on VoIP on a LAN network, if employees from the company already use softphones, then PC computers are enabled with voice softphones, PC computers are enabled with voice capabilities, an admin can install VPN clients for security by using an end to end encrypted tunnel.
- Firewall and Packetized Voice
The next security system is Firewall and Packetized Voice. Although Firewall and VoIP can be said to have a relationship that can't always be in rhythm, in real-time service. But VoIP is always trying to suppress so that there is no delay. That way, the condition of the firewall must first process the VoIP packets that are charged, then traffic flow can occur. H.323 and SIP rely on TCP for signaling and call setup, and DP for media packets. With H323 and SIP, the firewall will understand when the port should be open or closed for VoIP traffic, the port is usually open during a call. Even so, VoIP will still use the Real-Time Protocol in delivering packet media.
- VoIP Lockdown
Lastly is VoIP Lockdown. Equipment with IP PBX and VoIP gateway or some kind of SIP proxy. That way, the position of the server can be likened to a heart that is vulnerable to attack. For example, on cisco's windows based equipment, it is very easy to get NIMDA Worm. Operating systems tend to be vulnerable to attack, lots of viruses are made for the Microsoft platform rather than UNIX variants, the standard approach by using locking down Voip includes: Removing unnecessary services to reduce attack vectors, virus updates, and isolation on VoIP servers, there are others again by re-scanning the existing infrastructure, looking for deficiencies then rearranging the architecture.