VoIP Provider Compatibility

Compatible (Unencrypted SIP)

• Vonage Business — typically unencrypted on LAN
• Nextiva — can request unencrypted
• Ooma Office — unencrypted on LAN
• Grandstream UCM — configurable

Requires ATA/SBC (Encrypted)

• RingCentral — uses TLS/SRTP
• 8x8 — uses TLS/SRTP
• Microsoft Teams — uses TLS/SRTP
• Zoom Phone — uses TLS/SRTP
• Dialpad — uses TLS/SRTP
• GoTo Connect — uses TLS/SRTP

Varies by Configuration

• Comcast Business VoiceEdge — check with Comcast
• Spectrum Business — check with Spectrum
• Cox Business — check with Cox
• Windstream — check with Windstream
• Frontier — check with Frontier

Tip: If unsure, use a packet capture (Wireshark) to check if SIP traffic on port 5060 is readable. If you see INVITE messages in plain text, the Vertex will work.