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How can you implement VoIP security best practices in your network engineering career?

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Voice over Internet Protocol (VoIP) is a technology that allows you to make and receive phone calls over the internet, instead of using traditional phone lines. VoIP can offer many benefits for network engineers, such as lower costs, higher flexibility, and better integration with other applications. However, VoIP also poses some security risks, such as eavesdropping, spoofing, denial of service, and malware. To protect your VoIP network and your career, you need to implement some best practices for VoIP security. Here are some tips to help you do that.

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Ehsan Momeni Bashusqeh

Network Automation Engineer & Senior Network Engineer @Sadad Informatics Corporation; NetDevOps Enthusiast

1 Use strong encryption

Encryption is the process of converting data into a code that only authorized parties can read. Encryption can prevent hackers from intercepting and listening to your VoIP calls, or modifying them to cause confusion or damage. You should use strong encryption protocols, such as Secure Real-Time Transport Protocol (SRTP) or Transport Layer Security (TLS), to encrypt your VoIP traffic. You should also encrypt your VoIP devices, such as phones, routers, and switches, to prevent unauthorized access or tampering.

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Erick Ojwang

ACSYS SUPPORT/OPERATOR ATC Kenya
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Keep firmware up to date: Ensure that your VoIP devices are running the latest firmware to protect against known vulnerabilities. Control unnecessary access to onsite equipment: Limit physical access to VoIP devices and ensure that only authorized personnel have access to them.

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Jonah Chindomu

Experienced ICT Support Manager | Expert in Systems & Network Engineering | VSAT Specialist | Driving Technological Solutions at 1010Tech Pvt Ltd
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1. Network Segmentation: Segregate VoIP traffic from other network traffic by creating dedicated VLANs (Virtual Local Area Networks). Implement firewalls and access control lists (ACLs) to restrict access to VoIP networks and devices. 2. Encryption: Enable encryption for signaling and media traffic (e.g., SIP over TLS, SRTP) to protect against eavesdropping and tampering. Ensure that endpoints and network devices support secure protocols and configurations. 3. Firewall Configuration: Configure firewalls to allow only necessary VoIP traffic and block unauthorized access. Regularly review firewall rules to ensure they align with security policies.

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Robert Steinbacher

IT muss einfach sein - und sicher!
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Für eine vollst?ndige Verschlüsselung ist es notwendig, dass auch der VoIP Anbieter diese anbietet. Ansonsten kann an der PBX der externe Traffic dennoch mitgeh?rt werden.

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2 Update your software and firmware

Software and firmware are the programs that run on your VoIP devices and applications. They can contain bugs or vulnerabilities that hackers can exploit to compromise your VoIP network. To avoid this, you should update your software and firmware regularly, or enable automatic updates if possible. You should also use reputable and trusted vendors and sources for your VoIP software and firmware, and avoid downloading or installing anything from unknown or suspicious sites.

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Robert Steinbacher

IT muss einfach sein - und sicher!
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SSL Zertifikate haben teilweise nur eine Laufzeit von 1 Jahr. Also die Laufzeit dokumentieren und Unsicherheit wegen abgelaufenen Zertifikate vermeiden. Oftmals werden bei Firmwareupdates auch die Stammzertifikate sowie die CAs aktualisiert

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3 Configure your firewall and network

A firewall is a device or software that monitors and controls the incoming and outgoing traffic on your network. A firewall can help you block unwanted or malicious traffic, such as spam, phishing, or denial of service attacks, from reaching your VoIP network. You should configure your firewall to allow only the necessary ports and protocols for your VoIP traffic, and deny everything else. You should also segment your network into different zones, such as voice, data, and management, and apply different security policies and rules for each zone.

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Robert Steinbacher

IT muss einfach sein - und sicher!
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Sofern m?glich, sollten nur die IP Adressen des Betreibers in die Whitelist eingetragen werden und nur dessen Verkehr als zul?ssig deklariert werden

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4 Educate your users and staff

Users and staff are the people who use or manage your VoIP network. They can also be the weakest link in your VoIP security, if they are not aware of the risks or best practices. You should educate your users and staff about the importance of VoIP security, and how to avoid common threats, such as phishing, spoofing, or malware. You should also provide them with clear and simple guidelines and procedures for using and maintaining your VoIP network, such as choosing strong passwords, locking their devices, reporting incidents, and backing up data.

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5 Monitor and audit your VoIP network

Monitoring and auditing are the processes of collecting and analyzing data about your VoIP network performance, activity, and security. Monitoring and auditing can help you detect and prevent any problems or breaches on your VoIP network, such as poor quality, unauthorized access, or abnormal behavior. You should use tools and software that can monitor and audit your VoIP network in real time, and generate reports and alerts for any issues or anomalies. You should also review and update your monitoring and auditing policies and tools regularly, to ensure they are effective and compliant.

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Ehsan Momeni Bashusqeh

Network Automation Engineer & Senior Network Engineer @Sadad Informatics Corporation; NetDevOps Enthusiast
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Cisco IP SLA provides a UDP jitter operation where UDP packets are sent from the source device to a destination device. This simulated traffic is used to determine the jitter, the round-trip-time, packet loss and latency. This data is gathered for multiple tests over a specified period to identify how the network performs at different times in a day or over a few days. The VoIP monitor gathers useful data that helps determine the performance of your VoIP network, equipping you with the required information to perform network performance assessment, troubleshooting, and continuous health monitoring.

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Ehsan Momeni Bashusqeh

Network Automation Engineer & Senior Network Engineer @Sadad Informatics Corporation; NetDevOps Enthusiast
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OpManager primarily relies on Cisco's IP-SLA for monitoring the VoIP and the prerequisite therefore is, that the device should be a Cisco Router and must have IPSLA agent enabled on it. From IOS Version 12.3(14)T all Cisco routers support monitoring of VoIP QoS metrics. Cisco's IPSLA, an active monitoring feature of Cisco IOS software, facilitates simulating and measuring the above mentioned parameters to ensure that your SLAs are met.

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6 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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James Collum Jr

Sr. Network / Infrastructure Engineer
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Considering all previous points and sections mentioned to safeguard your voip, use this list of VoIP security best practices to guide the conversation with your VoIP service provider and put all feasible necessary measures in place. Also, keep actively monitoring your VoIP security on a regular basis so as to remain vigilant in your security measures.

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How can you implement VoIP security best practices in your network engineering career?

1

2

3

4

5

6

1 Use strong encryption

2 Update your software and firmware

3 Configure your firewall and network

4 Educate your users and staff

5 Monitor and audit your VoIP network

6 Here’s what else to consider

Network Engineering

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How can you implement VoIP security best practices in your network engineering career?

1

2

3

4

5

6

1 Use strong encryption

2 Update your software and firmware

3 Configure your firewall and network

4 Educate your users and staff

5 Monitor and audit your VoIP network

6 Here’s what else to consider

Network Engineering

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