What security measures should you take to secure your SIP trunking environment?

You must put no normal username, also the password must be strong one, and no publish it once in email or other network. So send it in 2 or 3 parts. You must put history in each registration

Employ robust authentication methods, such as strong passwords or multi-factor authentication, to control access to your SIP infrastructure. Additionally, encrypt SIP communication to safeguard sensitive data. Implementing multi-factor authentication (MFA) for SIP access, requiring users to verify their identity through a combination of passwords and one-time codes sent to their mobile devices. Encrypting SIP traffic using Transport Layer Security (TLS) to ensure secure communication between endpoints.

Your firewall must manage only IP addresses, blocking blacklisted IP. Your SBC must work in synchronisation with your firewall to update the blacklisted IP list. The SBC should manage thresholds errors to blacklisted IP when client register, call or any other requests. You must put many rules like blocking some destinations, some prefixes or blocking calls in strange times like weekends or holidays. Sure is linked with clients profiles calls. When you have a flooding calls, your thresholds CPS Call Per Second must block IP using blacklisted listed used by firewall, this later must did this in synchronisation with SBC.

Implement firewalls to control and monitor traffic between your network and the SIP provider. Deploy a Session Border Controller to manage and secure the border between your network and the SIP trunk. Setting up a firewall to control and monitor SIP traffic, allowing only authorized IP addresses to access the SIP infrastructure. Deploying a Session Border Controller to manage and secure the SIP border, preventing unauthorized access and protecting against potential denial-of-service (DoS) attacks. This helps prevent unauthorized access and protects against malicious traffic.

Regularly monitor and audit SIP traffic to identify any anomalies or suspicious activities. Using logging and analysis tools to monitor SIP traffic in real-time, identifying unusual call patterns or sudden increases in traffic that may indicate a security threat. Conducting regular audits of SIP logs to track user activities, ensuring compliance with security policies and detecting any unauthorized access.

Incorporate measures to detect and prevent fraud, such as rate limiting and anomaly detection. Implement real-time monitoring to identify unusual call patterns, enabling timely intervention to mitigate potential financial losses due to fraudulent activities. Employing anomaly detection algorithms to identify unusual call patterns, triggering alerts for immediate investigation and mitigation.

Provide comprehensive training for staff and users on security best practices and potential threats associated with SIP trunking. This includes educating them on recognizing phishing attempts, the importance of strong password practices, and maintaining a security-conscious mindset. Providing user guides and documentation that highlight security protocols and best practices for interacting with SIP systems.