VERIZON ONE TALK NETWORK REQUIREMENTS (checked against Verizon's pages on October 28, 2026)

DESK PHONES (hardwired by Ethernet or on Wi-Fi), outbound from the phone:
- Device configuration (setup): deviceact.myvzw.com · HTTPS (TCP) · port 443  [Verizon One Talk First Steps, Step 5; Verizon KB 206583: One Talk Desk Phone Ports and Protocols; Verizon One Talk FAQs]
- Call signaling: devicegw.myvzw.com, devicegw.gtm.myvzw.com · SIP over TLS (TCP) · port 5061  [Verizon One Talk First Steps, Step 5; Verizon One Talk FAQs]
    Note: KB 206583 instead lists deviceact.myvzw.com for signaling on HTTPS 443 and SIP-TLS 5061. Allow 5061 to all three hostnames.
- Voice / video media: Any (Verizon media servers) · SRTP (UDP) · port 1024–47383  [Verizon One Talk First Steps, Step 5; Verizon One Talk FAQs]
    Note: KB 206583 lists media ports as "ANY". Verizon names the protocol SRTP; it runs over UDP. Allow outbound UDP 1024–47383 at minimum.
- Network time (NTP): 0.pool.ntp.org, time.nist.gov (or your DHCP option 42 server) · NTP (UDP) · port 123  [Verizon One Talk First Steps, Step 5; Verizon One Talk FAQs; Verizon KB 206583: One Talk Desk Phone Ports and Protocols]
    Note: KB 206583 lists cn.pool.ntp.org. If NTP isn’t given by DHCP option 42, phones fall back to the US NIST pool. Time zone comes from the phone’s 911 address.

ONE TALK MOBILE & DESKTOP APPS on Wi-Fi or Ethernet, outbound from the device:
- Sign-in / device configuration: spc-mepfe.myvzw.com · HTTPS (TCP) · port 444  [Verizon One Talk First Steps, Step 5; Verizon KB 206583: One Talk Desk Phone Ports and Protocols; Verizon One Talk Desktop App guide (updated July 2025)]
- Sign-in (desktop app): xsi-vasp.myvzw.com · HTTPS (TCP) · port 8220  [Verizon One Talk Desktop App guide (updated July 2025)]
    Note: Listed only in the July 2025 Desktop App guide.
- 911 address provisioning: spg.vzw.com · HTTPS (TCP) · port 443  [Verizon One Talk First Steps, Step 5; Verizon KB 206583: One Talk Desk Phone Ports and Protocols; Verizon One Talk Desktop App guide (updated July 2025)]
- Call signaling: volte-ice.myvzw.com · SIP over TLS (TCP) · port 443 and 5061  [Verizon One Talk First Steps, Step 5; Verizon One Talk FAQs]
    Note: The Desktop App guide prints "433 & 5061" (almost certainly a typo for 443). KB 206583 lists volte-ice.vzw.com with "443 061" (likely 5061). Allow 443 and 5061 to both hostnames.
- Voice / video media: Any · SRTP (UDP) · port 1024–47383  [Verizon One Talk First Steps, Step 5; Verizon One Talk Desktop App guide (updated July 2025); Verizon One Talk FAQs]
    Note: KB 206583 lists "ANY".
- Messaging: v4bservices.vma.vzw.com, syncva.vzmessages.com · HTTPS (TCP) · port 443  [Verizon One Talk First Steps, Step 5; Verizon One Talk Desktop App guide (updated July 2025)]
- Messaging: mqtt.vzmessages.com · MQTT over TCP · port 443  [Verizon One Talk First Steps, Step 5; Verizon One Talk Desktop App guide (updated July 2025); Verizon One Talk FAQs]
    Note: KB 206583 also lists messaging on IMAP port 993 (no hostname). Allow outbound TCP 993 too.
- Visual voicemail: v4becs-vvm.lv.imsvm.com, vmas-v4b-reg.vzims.com · IMAP over TCP · port 143 and 443  [Verizon One Talk First Steps, Step 5; Verizon KB 206583: One Talk Desk Phone Ports and Protocols; Verizon One Talk FAQs; Verizon One Talk Desktop App guide (updated July 2025)]
    Note: First Steps, KB 206583 and the FAQ say TCP 143; the July 2025 Desktop App guide says TCP 443 and adds vmas-v4b-reg.vzims.com. Allow both ports.
- Directory download & log collection: deviceact.gtm.myvzw.com · HTTPS (TCP) · port 443  [Verizon One Talk Desktop App guide (updated July 2025)]
    Note: Listed only in the Desktop App guide.

ROUTER / 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.  [Verizon One Talk First Steps, Step 5; Verizon One Talk FAQs]
- SIP ALG: Disable SIP ALG and SIP transformations on the router/firewall.  [Verizon One Talk First Steps, Step 5; Verizon One Talk Desktop App guide (updated July 2025)]
- NAT: Enable consistent NAT.  [Verizon One Talk First Steps, Step 5; Verizon One Talk Desktop App guide (updated July 2025)]
- UDP session timeout: Increase the UDP timeout to 120 seconds or longer.  [Verizon One Talk First Steps, Step 5; Verizon 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).  [Verizon One Talk First Steps, Step 5; Verizon 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.  [Verizon One Talk First Steps, Step 5; Verizon One Talk Desktop App guide (updated July 2025)]

PERFORMANCE AND BANDWIDTH:
- Delay (latency): No more than 150 ms in any one direction.  [Verizon 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.  [Verizon KB 206583: One Talk Desk Phone Ports and Protocols; Verizon 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.  [Verizon KB 206583: One Talk Desk Phone Ports and Protocols; Verizon 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.  [Verizon 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.  [Verizon 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.  [Verizon 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.  [Verizon 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.  [Verizon KB 209694: One Talk Minimum Speed / Bandwidth Requirements; Verizon 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.  [Verizon One Talk First Steps, Step 5; Verizon 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.  [Verizon 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:
- Verizon One Talk First Steps, Step 5: https://www.verizon.com/support/one-talk-first-steps/
- Verizon KB 206583: One Talk Desk Phone Ports and Protocols: https://www.verizon.com/support/knowledge-base-206583/
- Verizon KB 209694: One Talk Minimum Speed / Bandwidth Requirements: https://www.verizon.com/support/knowledge-base-209694/
- Verizon One Talk Desktop App guide (updated July 2025): https://www.verizon.com/support/download-onetalk-windows-mac/
- Verizon One Talk FAQs: https://www.verizon.com/support/one-talk-faqs/
- Verizon One Talk Site Qualification & Validation Tool guide (PDF): https://scache.vzw.com/content/dam/support/pdf/one-talk/one-talk-sqt.pdf
Where Verizon’s own pages disagree, the notes above say so; allow the combined list.

Online version: https://wirelyconnect.com/connection-check/it-requirements
Wirely Connect is a Verizon partner that sets up and supports Verizon One Talk.