IP telephony security and best practices
In my experience, the IP telephony VoIP network is one of the most vulnerable networks as network administrators usually do not put much effort into this subnet or VLAN. Hence, attackers perform lateral movements, especially by compromising the VoIP servers, because usually domain admin credentials are found on these servers. So, securing the IP telephony network is very important and is divided into four major areas, which are as follows:
- Securing the IP telephony network
- Securing the IP telephone device
- Securing the media layer
- Securing the signaling layer
Securing the IP telephony network
The approach to securing the network is completely based on the architectural level where the network administrators will implement all the security solutions, such as the following:
- Firewall implementation to allow only the required services over UDP/TCP.
- SIEM attack monitoring solutions.
- VLAN segregation between...
