Importance of Firewall in VoIP Phone System

VoIP Phone System

VoIP Phone System constitutes an important part of the VoIP business. Firewall is an integral part of security. Usually known as the first line of defense, firewalls help prevent many cyber threats which if executed would have caused much damage to one’s computer and subsequently the VoIP Phone System.


VoIP phone system is a basic requirement. This helps anyone who wants to use VoIP for personal for business purposes. A firewall forms an important line of defense. It is a network security system. It is designed to prevent unauthorized access to or from a private network. Firewalls are important for a network because they help to prevent the intranets. The internet is the local network to which connects to one’s system. All messages which enter or leave the intranet passes through the firewall. The firewall, in turn, rn examines each message. It blocks those messages which do not meet the specified security criteria.

Firewalls are incorporated into a wide variety of network devices to filter traffic. It also lowers the risk that the malicious packets traveling over the public internet which threatens the security of the private network. A firewall isolates one’s computer from the internet using a “wall of code”. This checks individual data packets when they arrive at either side of the firewall. This process determines whether packets will pass or blocked.


VoIP and Firewall

VoIP or voice over Internet Protocol is such a technology which has revolutionized the world of telecommunications. As most of the functions of the VoIP phone system as well as the VoIP industry itself is online this results in its vulnerability. Cyber threats are always active and constantly search for any crack in the security. Security, therefore, is a priority. Overall strong security measures help to keep these threats at bay. There are a number of ways in which one can strengthen their security. The strong password, double verification, OTP key all are helpful. To know more about VoIP security, check here: BLOG .

Therefore for a VoIP phone system which is mostly online based, the firewall is necessary. Firewalls enable granular control and in turn, enhances the security. This control is mainly over what types of system functions and processes have access to networking resources. The firewalls are able to use various types of signatures and host conditions to allow or deny traffic. Although they sound complex, the whole process of installation, setup, and operation of firewalls are easy.



Hardware and Software Firewall

Firewalls are present in both forms: hardware and Software. The third type of firewall is a combination of both hardware and software. Apart from limiting access to one’s computer and network, a firewall is also useful for allowing remote access to a private network through secure authentication certificates and logins.


  • Hardware firewalls:

These are found as stand-alone products as well as in broadband routers. Firewalls in hardware form are an important part of system security and network set-up. A minimum of four network ports is present in most firewalls to connect to other computers. However, for larger networks, it is better to opt for business networking firewall solution.

  • Software firewall:

Installing the software firewall on a computer is similar to installing any other software program. A software firewall allows customization. It enables the user to gain some control over its function and protection features. The firewall in its software form protects the computer from outside attempts to control or gain access to one’s computer.



Firewall Functions

In simple words, a firewall is a software program or a hardware device that filters the information coming through the internet connection into one’s private network or computer system.

Some of the important functions of a firewall are:

  1. Defined resources
  2. Validate access
  3. Manage and control network traffic
  4. Record and report on events
  5. Act as an intermediary



Personal Firewall

High-speed internet though has many advantages, it also increases the vulnerability to cyber threats. Most personal firewalls are highly configurable and therefore one can easily create security policies to suit individual needs.

Some instances when a personal firewall is important are as follows:

  1. Surfing the internet at home using 24×7 active broadband connection.
  2. Connected to the internet via a public WIFI network in a park, café or airport.
  3. Running a home network which is kept isolated from the internet.
  4. When one wants to know when any program on a computer attempts to connect to the internet.



Firewall Filtering Techniques

Firewalls help in protecting both home and corporate networks.  The firewall prevents potentially harmful information from getting through.

The types of firewall techniques are as follows:

  1. Packet filter: Scrutiny of each and every packet entering or leaving the network. Packet rejection is on the basis of user-defined rules. This is fairly effective and transparent to users. However, packet filtering is difficult to configure. Also at times, it is susceptible to IP spoofing.
  2. Application Gateway: This applies security mechanisms to specific applications, such as FTP and Telnet servers. Application Getaway is very effective. But on the downside, it leads to performance degradation.
  3. Circuit level gateway: This applies security mechanism when a TCP or UDP connection is established. After the establishment of the connection, packets flow between hosts without further checking.
  4. Proxy Server: The proxy server intercepts all messages entering and leaving the network address.



Firewalls are the first line of defense in protecting private information. And in a VoIP business, any private information or any business related information is too valuable to fall into wrong hands. Therefore to avoid any chances of loses and avoid security breaches, one should implement firewalls to ensure security for one’s VoIP Phone System.

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