Vertex Cellular Network Setup Guide

1. Overview

More and more of my customers run their business on cellular service (Verizon, AT&T, T-Mobile) instead of a traditional landline or VoIP. The good news is that the EL-WC-4 still works perfectly — I just need to put a Fixed Wireless Access (FWA) device between the cell signal and the EL-WC-4. The FWA accepts the SIM card and exposes a standard analog (RJ-11) phone line. The EL-WC-4 reads Caller ID off that line exactly like it would on a landline.

This is an analog-only conversion. There is no SIP, no PBX, no IP phones in this picture. If the customer also needs SIP / VoIP phone handling, the Vertex is a separate solution and is covered in a different guide.

2. The Cellular → Analog Bridge: InHand CR202 Lite FWA

The InHand CR202 Lite FWA is a compact Fixed Wireless Access router with an FXS (analog phone) port built in. You put a voice-capable SIM in it, plug power and an antenna, and out comes a regular analog phone line. It does the entire cellular-to-analog conversion in one box.

Why I Use the CR202 Lite

• Real FXS phone port: The Caller ID is delivered as proper FSK between the 1st and 2nd ring — the same signal the EL-WC-4 has been reading off landlines for years. Nothing custom or proprietary.
• Carrier-agnostic: Same hardware works on Verizon, AT&T, or T-Mobile. Just change the SIM.
• Broad LTE band coverage: Including B71 (T-Mobile 600 MHz) and B14 (FirstNet/AT&T) for rural and public-safety customers.
• One device, no PBX gymnastics: No SIP server to stand up, no extensions to provision — it’s just a phone line at the end of an antenna.
• Easy install: Insert SIM, screw on antennas, plug in power, plug phone cord into the FXS port. That’s the install.

3. The Caller ID Reader: EL-WC-4

The EL-WC-4 is the CallerID.com analog Caller ID unit for this install. It takes the analog line straight from the CR202, reads the FSK Caller ID between the 1st and 2nd ring, and forwards the caller name and number over Ethernet to your POS, computer, or business software. Up to four analog lines on a single unit if you ever need to scale.

Why the EL-WC-4 Is the Right Fit

• Pure analog: No SIP, no IP phones, no extra adapter required. The CR202’s FXS port is exactly the kind of line it’s built to read.
• Ethernet out: Plugs into the same network as the POS — no serial cable required.
• Up to 4 lines: If the customer adds a second cellular line (second CR202), the same EL-WC-4 reads it on the next port. No additional hardware.
• Field-proven on landlines: Same hardware handling that has worked on POTS for years — the CR202 just hands it the analog signal it expects.

4. How Caller ID Flows Across Signal Types

The chain is the same in every install: cellular → CR202 (analog) → EL-WC-4 (reads CID) → POS over Ethernet.

5. Step-by-Step Setup: CR202 + EL-WC-4

Network Diagram

Step-by-Step

1. Activate the SIM: Get a voice SIM from the carrier with Caller ID delivery enabled. Insert it into the CR202.
2. Power up the CR202: Connect both LTE antennas, plug in 12V power. Wait for the cellular LED to go solid (good signal).
3. Verify dial tone: Plug any analog phone into the CR202’s FXS port. You should hear dial tone. Make a test call out to confirm voice works.
4. Cable CR202 → EL-WC-4: Move the RJ-11 cord from the test phone to Line 1 on the EL-WC-4.
5. Cable EL-WC-4 → LAN: Plug the EL-WC-4’s Ethernet port into the same network as the POS / computer.
6. Configure the POS / software: Point the POS Caller ID integration at the EL-WC-4’s IP (or use the standard CallerID.com listener service the POS already runs).
7. Test end-to-end: Call the cellular number from an outside phone. Confirm:
   • The CR202 rings (audible click / LED activity).
   • The EL-WC-4 logs the call on Line 1.
   • The caller’s number and name appear on the POS / computer.

6. Carrier-Specific Notes

7. Troubleshooting

8. Recommended Equipment

9. Support Call Checklist

When a customer calls about adding CallerID.com to a cellular-only business, I work through this list in order:

10. FAQ

Q: Can I plug my cell phone directly into the EL-WC-4?

A: No. A cell phone uses proprietary cellular protocols. You need the InHand CR202 Lite to convert the cellular signal into a standard analog phone line first — then the EL-WC-4 reads it just like a landline.

Q: Will a Bluetooth adapter from my phone to the EL-WC-4 work?

A: No. Bluetooth audio doesn’t carry Caller ID data in a format we can read. The signal has to be converted to a real analog phone line by the CR202, and then the EL-WC-4 reads the FSK Caller ID off that line.

Q: Does this work with 5G?

A: Yes. The CR202 uses LTE, which 5G networks fall back to for voice calls (VoLTE). When 5G standalone voice (VoNR) becomes the default, InHand will release firmware updates — but for everyday voice today, LTE is what carries the call.

Q: I already have a Verizon FiOS line — do I need any of this?

A: No. FiOS includes an analog phone adapter (the ONT). That’s already a normal analog line — plug the EL-WC-4 straight into it. This guide is only for customers whose only phone service is cellular.

Q: Can I use a mobile hotspot instead of the CR202?

A: No. A hotspot provides internet data only — it doesn’t carry voice calls or Caller ID. The CR202 specifically handles the voice side of the cellular plan and gives you a real analog phone line.

Q: What if I add a second cellular line later?

A: Add a second CR202 for the second line and plug it into Line 2 on the same EL-WC-4. One EL-WC-4 handles up to four analog lines, so you don’t need a second reader until line 5.

Q: Does this work with VoIP phones?

A: Not directly — this is an analog-only conversion. The EL-WC-4 reads the Caller ID off the analog line; it does not deliver SIP to a phone. If the customer also needs SIP/VoIP phones running off the cellular line, that’s a separate (Vertex-based) setup — I’ll handle that as a different conversation.

Q: How do I switch a Verizon One Talk Yealink T77LTE from cellular to Ethernet/LAN?

A: First complete the phone’s initial LTE activation. Then, from the idle screen, swipe left to the second idle screen and open Settings → Switch Account → Switch Account Mode → LAN Mode. Tap Exit on the E911 notification screen. After the switch, test the phone and the local signaling path. LAN Mode may still use encrypted SIP-TLS, which a passive Vertex cannot read; if that occurs, use the approved SBC or analog fallback.