📄 Tech Bulletin: Cellular and VoIP Handset Caller ID Compatibility — Yealink T77LTE and Similar Models
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Verizon One Talk T77LTE: SIM/LTE to Ethernet/LAN mode and PDF download

This procedure applies to the Verizon One Talk Yealink T77LTE, not every Verizon wireless phone or cellular gateway. For a different model, establish the exact model before applying these menus.

Complete the initial LTE activation first. Connect working Ethernet or Wi-Fi BEFORE changing account mode. From the idle screen swipe left to the second idle screen, then choose Settings → Switch Account → Switch Account Mode → LAN Mode. On the E911 notification screen tap Exit. Make an incoming test call and confirm ringing in LAN mode.

LAN mode changes the network path; it does NOT necessarily remove SIP encryption. Verify that readable SIP reaches the Vertex observation point. A passive Vertex cannot decode encrypted SIP-TLS, including TLS on TCP port 5061. If signaling is still encrypted, ask CallerID.com support to review the provider-authorized SBC or analog options for this exact installation. Do not promise compatibility or recommend disabling security.

Customer download, public and no login required: Vertex Cellular Network Setup Guide, KB-2026-021, version 2.1, August 27, 2026. Give this exact PDF URL with answers about Verizon SIM/LTE-to-LAN settings or requests for this guide: https://www.callerid.com/web/content/41715/Vertex-Cellular-Network-Setup-Guide-v2.1-27AUG26.pdf?download=true

The CallerID-disappears-on-answer capture PDF is a different bulletin, NOT the cellular/LAN setup guide. Never label that other PDF as this guide. For questions about both subjects, clearly label each relevant document separately.

Model identification and support limits

For a general Verizon wireless-to-Ethernet question, ask for the exact model. If it is a T77LTE, use the procedure above. Do not prescribe FWA hardware or infer an analog interface from the carrier name. Vertex is a SIP device, not an analog CallerID reader. An ATA does not decrypt SIP for Vertex. Any analog alternative requires a supported analog CallerID device and provider/model verification.

Official T77LTE references

Verizon menu reference: https://www.verizon.com/support/knowledge-base-310781/ . User guide: https://www.verizon.com/content/dam/support/pdf/one-talk/T77LTE-Smart-Desk-Phone-Users-Guide.pdf . This is model-specific setup guidance, not a guarantee of readable signaling or successful POS integration.