Fibre to home and Digital Voice

[WSH]

The SH2 needs to be directly connected to the phone socket/ONT for digital voice.  I did mine this way:

Smart Hub 2 (SH2) router settings:

IPv4 DHCP off.  (The addresses here are best set as static addresses but you can use dynamic addressing if you want).

IPv6 DHCP to ‘Stateless’. (If possible).

Router itself set to a static IP of 192.168.1.254 and a subnet mask of 255.255.255.0 or /24, (the defaults).

DMZ host set to 192.168.1.2  (This helps with double NAT problems or at least it takes care of the port forwarding on the SH2.  There is still address translation happening, however, so you may still have problems with multiplayer games, UPnP etc.  In fact, you only really need this if you have incoming external connections to a server etc.  Personally, I’ve never found double NAT to be an issue and I don’t use the DMZ setting.  Note, this setting allows a lot of traffic to effectively bypass the SH2 firewall, so you are relying on your own router’s firewall for security, just as if it was directly connected to the internet).

Turn off the Wi-Fi in favour of your own router.  (This may also be a good security move if you do enable the DMZ host.  I would still expect Wi-Fi traffic on the SH2 to go through its firewall but I can’t be sure how they’ve set it up internally).

Connect the DSL port to the phone socket on the wall, (or the WAN port to the ONT, if on FTTP).

DV phone/extension then plugs into the phone socket on the Smart Hub 2.

Own router settings:

IPv4 DHCP on, range 192.168.0.2-192.168.0.200  (Note the 0 in the third position, making this a separate network to the SH2.  This is deliberate, not a typo).

IPv6 set as DHCPv6 Client.

Router itself is on a static IP of 192.168.0.2 and subnet mask of 255.255.255.0 or /24  (if using static addresses.  If dynamic, set it to get an address automatically).

Enable the EWAN port and set it to a fixed IP of 192.168.1.2, (so it is part of the SH2 network).

Gateway set to 192.168.1.254, (again, pointing to the SH2).

DNS set to 192.168.1.254 (or whatever you usually use).

The EWAN socket on your own router (probably no.4) connects to a LAN port on the SH2.

(NB. This will not work if you use the DSL port on your own router).

Lastly, any static addresses on devices in your own network will also need to match the network address of 192.168.0.x, of course.

[straightwave]

OK WSH, many thanks for this. 

[Sue41]

Yes that's what I thought 🤔 thanks for your reply.

[straightwave]

4 Port ONT: Regarding the option that I asked about - of using the 4 port ONT

1. The diagram supplied by Distinguished Sage Beddoe - Message3 - shows a 4 port ONT. 

Accordingly, I queried using one port  to the HH2 for DV/ phone and a second port to my Draytek, seemed a reasonable idea..

2. However, after looking further at the BT equipment lists, I see no 4 port mentioned. 

3. More significantly in https://community.bt.com/t5/Archive-Staging/4-Port-Modem/td-p/2077776/page/2, the message string states that an ONT only provides one service and only one router can be connected to it.

So the only option is to attempt the method according to WSH, which I do not feel is necessarily deterministic for my set up and leaves me apprehensive about how long this will take to set up with the Draytek and numerous attached network components.

A consequence of BT constraining to homehub2 for DV and its shortfall in not having a pass thru WAN mode, this is not acceptable in my view.

As has been said, I have a choice of supplier :0)

[licquorice]

A 4 port ONT is totally irrelevant.

The 4 ports would provide 4 discrete services, not 4 outputs of one service. It is not a router it is a fibre modem.

[straightwave]

Ok, understood that the ONT wont be an option for my set up..

I dont quite get the terminology though and without more knowledge of BT's ONT its a bit hard to say.

Modem means modulator / demodulator. i.e. a baseband signalling device translating a wave into digital (and vice versa) , physical layer 1.

A router is a layer 3 Ip, so I would think the ONT is a router, or has some switching capability as it seems to be discriminating the multiplexed services presented and routing services to the ports?

[licquorice]

The ONT is an optical modem. It modulates the laser with the Ethernet input and demodulates the received optical signal to provide an Ethernet output.

You can read about how GPON works here https://www.draytek.co.uk/information/blog/gpon-fibre-fttp-what-is-it-and-how-does-it-work

@WSH  has provided a comprehensive set of instructions to achieve your goals, just follow them.

However, as has been pointed out several times, a far simpler solution is to just use a third party VoIP provider.

[iniltous]

A multi port ONT , is used ( as stated ) if a customer wanted 2 or more separate FTTP ‘lines’ , if for  example someone had Sky FTTP for their own personal use , and their business/ employer paid BT for another service at the address , the options are two separate ‘lines’ from the telegraph pole ( if overhead service ) and two separate ONT ‘s , each ONT requiring its own  power outlet  ( you seem concerned about this type of thing ) a multiport ONT needs only one power outlet and one cable from the pole , and it’s arranged that the Sky service appears on port one of the multi port ONT and the BT service on port two ( you could have 4 separate services one on each port ) , but you obviously you need a router connected to each live ONT port .

[WSH]

I think your confusion with the “port 4” stems from the early ONTs also having a phone port.  There was originally an idea to run phone services directly through the ONT.  This was dropped long ago.  Even if the ONT has a phone port, (and new ones won’t), it will not work.

The 2766 is a router with a built-in modem.  In the setup you are proposing the modem function is not used and it functions as just a router.   The modem’s function is to translate the incoming signal into something the router can understand and that is all it does.  As you say, it’s a physical process.  As Licquorice says, the ONT is the modem with FTTP.

The 2766 is the G.Fast capable version of the 2763/65.  The instructions I’ve left you are based on my current 2762, the predecessor of the 2763/65, so the 2766 should be identical.

The method is essentially generic, however.  I used the same technique years ago when I moved from ADSL to FTTC/VDSL and had a Billion 7800 that was only ADSL capable.  I ran it through a Home Hub 5b for two years without any problems.  It’s just very basic networking and should work on any equipment.  Unfortunately, if the out of the box stuff won’t do, you’ll need to get your hands dirty.

[WSH]

And a friend of mine has just spotted a mistake.   When I said set your own router to 192.168.0.2 that should have been 192.168.0.1, otherwise it clashes with the DHCP range.