Voice traffic on IP networks faces threats that traditional phone lines never encountered. Here is what matters for business VoIP security in 2026.
Real Threats
Toll fraud is the most financially damaging attack. Hackers access SIP credentials and make thousands in international calls. Global losses exceed ten billion dollars annually.
Eavesdropping on unencrypted VoIP is trivially easy with free tools like Wireshark. Unlike PSTN wiretapping which requires physical access, unencrypted SIP and RTP can be captured by anyone on the network.
What Protects You
Must Have
- TLS 1.3 for SIP signaling (port 5061, never unencrypted 5060)
- SRTP for voice media
- Strong SIP passwords (16 plus characters)
- Dedicated voice VLAN
- Session Border Controller at network edge
- SIP ALG disabled on router
Strongly Recommended
- Real-time alerting on international call spikes
- Daily spending limits per extension
- SOC 2 Type II certified provider
- Geo-redundant infrastructure with DDoS protection
Choosing a Secure Provider
Ask: Do you encrypt ALL calls by default? What is your fraud detection response time? When was your last SOC 2 audit?
platforms like VestaCall (https://vestacall.com) that include everything in the base price builds security into every layer. But verify claims yourself — ask for the audit report.
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