What is Firewall?

A firewall is a security device (either hardware or software) that surveils and controls network traffic based on predefined security rules. In VoIP environments, firewalls protect communication systems from cyber threats such as DoS attacks, SIP flooding, and call hijacking. Firewalls use techniques like packet filtering, deep packet inspection, and session monitoring to analyze and block potentially harmful traffic. VoIP-specific firewalls are often configured to prioritize voice packets, ensuring minimal latency and jitter. To maintain a secure VoIP environment, businesses must configure their firewall to allow legitimate SIP and RTP traffic while blocking unauthorized access. A properly configured firewall safeguards VoIP systems from threats and ensures the integrity of sensitive voice data.