FAQ
TL;DR: For VoIP with Orange FunBox and Sagemcom 2704, use 2 wires to the FunBox and 2 back to phones; "polarization matters." Configure the 2704 as an AP by changing its IP and disabling DHCP to extend Wi‑Fi. [Elektroda, ---trafopowielacz---, post #16798817]
Why it matters: This setup keeps your phone, wired PC internet, and whole‑home Wi‑Fi working without double‑NAT or dropouts.
Quick Facts
- FunBox VoIP can back‑feed landline sockets using the spare pair in a 4‑wire cable. [Elektroda, ---trafopowielacz---, post #16798817]
- Picking up a handset can drop the internet if a splitter is misused or wiring is wrong. [Elektroda, pilnik88, post #16801555]
- Sagemcom 2704 works as an access point by changing its IP and turning off DHCP. [Elektroda, piotrek22101, post #16798857]
- Flashing OpenWrt on the 2704 risks bricking; use AP mode instead for simplicity. [Elektroda, makosuu, post #16799752]
- FunBox includes a built‑in phone test to verify VoIP without calling. [Elektroda, ---trafopowielacz---, post #16798845]
How do I connect Orange FunBox and keep VoIP working on house phones?
Terminate the incoming line to the FunBox. Use the spare two wires to return dial tone from the FunBox’s phone port to house sockets. Observe polarity. This keeps VoIP active on existing phones without extra adapters. "Polarization matters." [Elektroda, ---trafopowielacz---, post #16798817]
Should the phone plug into the FunBox or the wall jack?
For VoIP service, plug the phone into the FunBox’s phone port. If you want phones at other jacks, back‑feed that output over the spare pair to the wall circuit. Do not parallel it with the raw line. [Elektroda, ---trafopowielacz---, post #16798817]
Can I use my Sagemcom Fast 2704 to extend Wi‑Fi without flashing new firmware?
Yes. Connect it LAN‑to‑LAN from the FunBox, change the 2704’s IP to the FunBox’s subnet, and disable DHCP. It will act as an access point and extend coverage. [Elektroda, piotrek22101, post #16798857]
How do I set up the Sagemcom 2704 as an Access Point (AP)?
- Log into the 2704, set a unique LAN IP in the FunBox subnet, and save.
- Disable DHCP on the 2704 and set Wi‑Fi SSID/password and channel.
- Connect FunBox LAN to 2704 LAN and reboot both devices. [Elektroda, piotrek22101, post #16798857]
Is flashing OpenWrt on the Sagemcom 2704 a good idea here?
Not for basic range extension. Forum advice warns of a real risk of bricking the router during flashing. Use AP mode instead unless you need advanced routing features. [Elektroda, makosuu, post #16799752]
What changes if I do flash OpenWrt on the 2704?
With the suggested build, the 4th LAN port becomes a WAN port. That allows a router‑behind‑router design, which adds complexity and can cause double‑NAT if misconfigured. This is only for advanced users. [Elektroda, ---trafopowielacz---, post #16798845]
Why does picking up the phone disconnect my internet?
A misused RJ11/DSL splitter or incorrect wiring can load the DSL line, causing sync drops when a handset goes off‑hook. Correct the wiring or remove the splitter to restore stability. [Elektroda, pilnik88, post #16801555]
What causes crackling on the phone after rewiring, and how do I fix it?
Loose or poor‑quality cable segments introduce noise. Replacing the suspect run with proper twisted‑pair and secure terminations cleared the crackling in this case. Check every junction and replace damaged spans. [Elektroda, pilnik88, post #16815870]
How do I use one 4‑wire cable for both DSL to the FunBox and phones back to rooms?
Use one pair from the entry point to feed DSL to the FunBox. Use the spare pair from the FunBox’s phone port to back‑feed dial tone to other rooms. Keep pairs twisted and polarity correct. [Elektroda, ---trafopowielacz---, post #16798817]
What is VoIP in this setup?
VoIP means your phone service comes through the FunBox over the internet, not the raw copper line. The FunBox converts it to analog for your phones and can distribute dial tone over existing pairs. [Elektroda, ---trafopowielacz---, post #16798817]
What is an Access Point (AP)?
An AP is a device that bridges your wired network to Wi‑Fi without doing separate routing. In this thread, the 2704 should act as an AP, not a second router. [Elektroda, makosuu, post #16799752]
What is an RJ11 splitter and should I use one here?
An RJ11 splitter divides a single jack into two. Using it to combine DSL and phone on the same run can cause interference and dropouts. Route DSL to the FunBox and back‑feed phone separately instead. [Elektroda, pilnik88, post #16801555]
How can I test the phone on the FunBox without making a call?
Use the FunBox’s built‑in phone test feature. It verifies VoIP status and wiring. "In Funbox you have the option of testing your phone." Run it after each change. [Elektroda, ---trafopowielacz---, post #16798845]
My Wi‑Fi coverage is weak. What’s the simplest path to better range?
Place the 2704 as a wired AP on another floor or far room. Change its IP, disable DHCP, and reuse your main SSID and password for seamless roaming. This solved coverage issues in the thread. [Elektroda, piotrek22101, post #16798857]
In Funbox you have the option of testing your phone, it can help when you connect because you do not need to call. 