How secure is a VoIP phone system and how do I protect against fraud?

Modern hosted VoIP systems are highly secure when properly configured, using multiple layers of protection to safeguard your business communications.

Security measures in hosted VoIP:

• Encryption – calls are encrypted using TLS (signalling) and SRTP (media), preventing eavesdropping
• Firewall protection – enterprise-grade session border controllers (SBCs) protect against unauthorised access
• Authentication – strong passwords and two-factor authentication for user accounts and admin portals
• Fraud detection – automatic monitoring for unusual call patterns (e.g. sudden spikes in international calls)
• Geo-blocking – restrict calls to specific countries to prevent toll fraud
• Regular updates – your provider applies security patches automatically

Common VoIP security threats and how to prevent them:

• Toll fraud – hackers making expensive international calls on your account. Prevention: geo-blocking, call spend limits, strong passwords
• Eavesdropping – intercepting call audio. Prevention: TLS/SRTP encryption
• Denial of service – flooding your system to disrupt calls. Prevention: SBC protection, DDoS mitigation
• Phishing – social engineering to obtain login credentials. Prevention: staff training, two-factor authentication

Connection Technologies partners with providers that maintain ISO 27001 certification and comply with UK data protection regulations. Discuss security requirements with our team.