VoIP refers to the transmission of voice over a network that uses the Internet Protocol, where IP stands for the Internet Protocol, which is the backbone of the Internet. The Internet Protocol can transfer emails, instant messages, and web pages to thousands of PCs on the phone. All attacks that affect the data network may affect the VoIP network, such as viruses, spam, trespassing, DoS, phone hijacking, eavesdropping, data sniffing, etc. The only difference is that we are more willing to take some measures to protect other networks. For VoIP, there are few specific measures. In fact, only if we take some protective measures, this technology can achieve real success. The following discusses methods that can protect VoIP: 1. Restrict all VoIP data to be transmitted to only one VLAN Cisco recommends that you separate VLANs for voice and data, which helps to prioritize voice and data. Dividing VLANs also helps prevent cost fraud, DoS attacks, eavesdropping, and hijacking communications. The division of VLAN makes the user's computer form an effective closed circle. It does not allow any other computer to access its equipment, thus avoiding computer attacks, and the VoIP network is quite safe; even if it is attacked, it will lose drop to lowest. 2. Monitor and track the communication mode of the VoIP network Monitoring tools and intrusion detection systems can help users identify those attempts to invade a VoIP network. Observing the VoIP logs in detail can help to discover some irregularities, such as inexplicable international calls or international calls that the company or organization basically does not contact, multiple login attempts to crack passwords, and a surge in voice. 3. Protect the VoIP server Effective measures must be taken to ensure the security of the server to prevent intruders from inside or outside from intercepting data using sniffing technology. Because the VoIP phone has a fixed IP address and MAC address, it is easy for attackers to sneak in accordingly. It is recommended that users restrict IP and MAC addresses, do not allow random access to the super user interface of the VoIP system, and establish another firewall in front of the SIP gateway, which will limit the intrusion into the network system to a certain extent. 4. Use multiple encryption It is not enough to encrypt only the sent data packets. All telephone signals must be encrypted. Dialogue encryption will prevent the interceptor's voice from being inserted into the user's conversation. In this regard, the SRTP protocol can encrypt endpoint communication, and TLS can encrypt the entire communication process. Voice transmission encryption should be supported by providing strong protection at the gateway, network, and host levels. 5. Establish a redundant mechanism for VoIP networks Always be prepared to be attacked by viruses and DoS, which may cause the network system to be paralyzed. Build a network system that can set up multiple nodes, gateways, servers, power supplies, and call routers, and interconnect with more than one supplier. Regularly test each network system to ensure that it is working well. When the main service network is down, the backup facility can quickly take over the work. 6. Separate the internal network from the Internet It is a good choice to put the telephone management system and the network system outside the direct access to the Internet, and place the voice service and other servers in separate domains and restrict their access. 7. Minimize the use of softphones (softphone) VoIP soft terminal phones are susceptible to computer hackers, even if it is located behind the company's firewall, because this kind of thing is used with ordinary PC, VoIP software and a pair of headphones. Moreover, the soft terminal phone does not separate voice and data, so it is vulnerable to viruses and worms. 8. Businesses using digital security certificates If the IP phone provider can provide a certificate to authenticate the device, users can basically be confident that their communication is safe and will not broadcast to other devices. 9. Ensure the security of the gateway The gateway should be configured so that only approved users can make or receive VoIP calls, and list those users who have been authenticated and approved. This can ensure that other people cannot make free calls while busy. Through the combination of SPI firewall, application layer gateway, network address translation tool, SIP support for VoIP soft client, etc., to protect the gateway and the local area network behind it. 10. Assess the actual safety Make sure that only authenticated devices and users can access those restricted Ethernet ports. Administrators are often spoofed to accept requests from soft terminal phones without permission, because hackers can easily mimic IP addresses and MAC addresses by plugging in RJ44 ports.
Radio modems are dedicated to transfer data between two or more locations. GrandComm`s radio modems operate in VHF and UHF frequency band and can cover a distance of over 50 kilometers. The radio modems can provide programmable serial baud rates from 1200bps to 115200bps.
GrandComm`s radio modem products are designed to industrial standards and well-suited for SCADA, telemetry and process control applications in wireless environment. The radio modem can communicate data of remote control signals, telemetry signals from a transducer, computer`s RS232 port, GPS position signals, or a digital terminals.
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