Verizon One Talk network requirements

Desk phones: plugged in by Ethernet or on Wi-Fi

One Talk mobile & desktop apps on Wi-Fi or Ethernet

Router and firewall settings

• Traffic markings (QoS): Default DSCP: voice/video (RTP) 46 (EF); signaling (SIP) 26 (AF31). Have your switches and Wi-Fi honor these markings. (One Talk First Steps, Step 5, One Talk FAQs)
• SIP ALG: Disable SIP ALG and SIP transformations on the router/firewall. (One Talk First Steps, Step 5, One Talk Desktop App guide (updated July 2025))
• NAT: Enable consistent NAT. (One Talk First Steps, Step 5, One Talk Desktop App guide (updated July 2025))
• UDP session timeout: Increase the UDP timeout to 120 seconds or longer. (One Talk First Steps, Step 5, One Talk Desktop App guide (updated July 2025))
• Firewalls and filters: Make sure the required ports aren’t blocked. Traffic must be allowed through any filtering device on your network (firewalls, IDS, SBC). (One Talk First Steps, Step 5, KB 206583: One Talk Desk Phone Ports and Protocols)
• Hostnames: Verizon says these hostnames (FQDNs) can change. Allow by hostname where your firewall supports it, and re-check Verizon’s pages before making changes. (One Talk First Steps, Step 5, One Talk Desktop App guide (updated July 2025))

Performance and bandwidth

• Delay (latency): No more than 150 ms in any one direction. (KB 206583: One Talk Desk Phone Ports and Protocols)
• Jitter: No more than 40 ms. Verizon’s site test treats under 5 ms as optimal. (KB 206583: One Talk Desk Phone Ports and Protocols, One Talk Site Qualification & Validation Tool guide (PDF))
• Packet loss: Under 1% on the internet (WAN) and under 0.05% on the local network (LAN). Verizon’s site test treats 0.1% or less as optimal. (KB 206583: One Talk Desk Phone Ports and Protocols, One Talk Site Qualification & Validation Tool guide (PDF))
• Upload bandwidth: Ideal: 1 Mbps per computer + 100 kbps per desk phone (example: 10 PCs + 10 phones = 11 Mbps upload). Under 50% of that risks connection or voice problems. (KB 209694: One Talk Minimum Speed / Bandwidth Requirements)
• Data per call: About 0.5 MB per minute for a voice call; about 3.5 MB/min one-way video and 6.6 MB/min two-way video. (One Talk FAQs)
• Internet type: Always-on broadband. DSL and satellite aren’t recommended for desk phones; 4G LTE broadband routers are an alternative. Verizon doesn’t support third-party routers. (KB 209694: One Talk Minimum Speed / Bandwidth Requirements)
• IP addresses (DHCP): Make sure your router’s DHCP pool has enough addresses for every phone, computer, tablet, printer and other device. Some routers hand out only about 10. (KB 209694: One Talk Minimum Speed / Bandwidth Requirements)

Wi-Fi and wired

• Desk phones: One Talk desk phones connect to your network by Ethernet cable or Wi-Fi. The same desk-phone ports above apply either way. (KB 209694: One Talk Minimum Speed / Bandwidth Requirements, One Talk First Steps, Step 5)
• Apps on Wi-Fi or Ethernet: The One Talk mobile and desktop apps, when registered over Wi-Fi or Ethernet, use the "apps" list above. (One Talk First Steps, Step 5, One Talk FAQs)
• Sharing one network jack: A desk phone can share one Ethernet jack with a computer: router → phone’s internet port, then phone’s PC port → computer. (One Talk FAQs)

Also good to know

• No static IP and no inbound port forwarding are needed. Every connection Verizon lists goes out from the phone or app to Verizon. (Wirely note: Verizon doesn’t say this in one sentence, but nothing on its lists needs either. Don’t open inbound ports or turn off the firewall.)
• DNS: Verizon doesn’t list DNS, but phones and apps must be able to resolve the hostnames above with your normal DNS (UDP/TCP 53, usually handed out by DHCP). (Wirely note.)
• Wi-Fi tuning: Verizon’s pages don’t give Wi-Fi settings beyond the port lists. General good practice (not a Verizon requirement): 5 GHz with a strong signal where phones are used, and Wi-Fi QoS/WMM that honors DSCP 46. (Wirely note.)
• Verizon’s advanced site test (the Site Qualification & Validation tool) needs these ports only while it runs: TCP 20000, 20001, 5060, 554; UDP 20000, 20001, 8090, 554, 555, 556; HTTP 80, 8080. (Source: KB 206583.)

Sources (checked October 28, 2026): Verizon One Talk First Steps, Step 5 · Verizon KB 206583: One Talk Desk Phone Ports and Protocols · Verizon KB 209694: One Talk Minimum Speed / Bandwidth Requirements · Verizon One Talk Desktop App guide (updated July 2025) · Verizon One Talk FAQs · Verizon One Talk Site Qualification & Validation Tool guide (PDF). Rows marked ⚠ are places where Verizon’s own pages disagree; allow the combined list. Hostnames can change, so re-check Verizon’s pages before changing firewall rules.