Importance of Firewall in a VoIP Phone System

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VoIP or Voice Over Internet Protocol is such a
technology which has revolutionised the world of
telecommunications. Cyber threats are always
active and constantly search for any crack in the
security. Therefore for a VoIP phone system which
is mostly online based, firewall is necessary.
Firewalls enable granular control and in turn
enhances the security.
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• Firewall forms an important line of defence.
• Firewall is a network security system designed to
  prevent unauthorised access to or from a private
  network.
• Firewalls are important for a network because
  they help to prevent the intranets.
• Firewall lowers the risk that the malicious
  packets travelling over the public internet which
  threatens the security of the private network.

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• Firewalls are present in both forms hardware and
  Software.
• The third type of firewall is a combination of
  both hardware and software.
• Hardware firewalls These are found as
  stand-alone products as well as in broadband
  routers.
• Software firewall These are installed on a
  computer like any other software program. It
  enables the user to gain some control over its
  function and protection features.

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• Some of the important functions of a firewall
  are
• Defined resources
• Validate access
• Manage and control network traffic
• Record and report on events
• Act as an intermediary

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• Reasons as to why we need personal firewall
• Surfing the internet at home using 24X7 active
  broadband connection.
• Connected to the internet via a public WIFI
  network in a park, café or airport.
• Running a home network which is kept isolated
  from the internet.
• When one wants to know when any program on a
  computer attempts to connect to the internet.

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• Packet filter Scrutiny of each and every packet
  entering or leaving the network. Packets are
  rejected based on user-defined rules.
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• Application Gateway This applies security
  mechanisms to specific applications, such as FTP
  and Telnet servers.
• Circuit level gateway This applies security
  mechanism when a TCP or UDP connection is
  established. After the connection is established,
  packets can flow between hosts without further
  checking.
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• Proxy Server The proxy server intercepts all
  messages entering and leaving the network
  address.

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