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VOIP - Why all the misinformation?

m0ffy

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24 May 2022
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366
Location
Leicestershire
My 2012 Panasonic has no switch or alternative socket and the manual says nothing about it being VOIP-ready (or not). I also have an unpowered handset bought as a safeguard against power cuts before I had a mobile. Both work without any adjustment with the new EE router using the analog socket; other routers may be different. There may be antique handsets which won't work but it seems unlikely.

The phone itself doesn’t care if it’s plugged into an ATA or an analogue exchange. It’s only interested in whether it can see the appropriate voltage. The ATA (whether separate, or built into the router) only cares about whether the phone can go off hook/on hook and send DTMF tones. Every cordless phone can do this, so can all wired push button phones.
 
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jfollows

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26 Feb 2011
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Wilmslow
The misinformation I do have a problem with is all the happy-clappy installation instructions. Now, to be fair, I was a computer networking specialist back in the day, so I'm reasonably au fait with the technology, but separately from BT and Virgin they supply "simplistic" instructions which make little sense to me, and what I wanted in both cases was a single clear diagram of what went where, of the kind that an installation engineer might be supplied with I guess.
I worked it all out, but it was a bit frustrating, having to search the Internet for some of the answers, but I really didn't like the "instructions" I was sent.
As others have said here, some of the guff is irritating when it's imprecise or just wrong.
 

najaB

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28 Aug 2011
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Scotland
New systems don't support pulse-dialling, so if you have one of those phones and tried plugging it into a router then it wouldn't work. You do get converter boxes if you're desperately attached to your old rotary dial phone.
Interestingly, I was able to get a rotary phone to work with a BT Broadband Voice router supplied as recently as 2015. No idea what's happened since as I left BT in 2017 but I wouldn't be surprised if some routers still supported pulse dialling, even unofficially.
 

sor

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15 Nov 2013
Messages
784
Interestingly, I was able to get a rotary phone to work with a BT Broadband Voice router supplied as recently as 2015. No idea what's happened since as I left BT in 2017 but I wouldn't be surprised if some routers still supported pulse dialling, even unofficially.
None of the BT/EE routers which support "Digital Voice" can do pulse dialing. There aren't that many VoIP ATAs that can do it either, certainly the Sipura/Linksys/Cisco line (which is popular and is used by BT themselves for business phone services) never could.

Another pitfall is the lack of a bell wire on some equipment which means old phones won't ring (including virtually anything that needs pulse dialing). Not a problem for the BT supplied kit, but others who use American-spec equipment have not realised this. RJ11 to BT plug adapters can regenerate it but not all ISPs supply the variant with built in capacitor, likely because it costs a bit more
 

Devonian

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10 Sep 2019
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218
Location
Totnes
The truth of the conflation of the digital switch off with fibre roll-out depends on where you live. In some areas, where there is a 'stop sale' on all copper-based services, then if a fibre connection is possible, it will be the only option for either new connections or changes of supplier - or even recontracting with the same supplier in some cases. In other areas, both full-fibre and part-fibre services may be available depending on your supplier of choice. Existing fibre to the cabinet (part fibre, FTTC) services will continue over copper wires to the home in many areas, not least in areas where there are no current plans for full-fibre at all.

There is already a nationwide stop-sale on new traditional PSTN phone lines - but I have a feeling that you might just be able to get a few LLU/MPF services installed in some areas.

This thread is throwing up some interesting points, so a summary of some myths that are reflected in this thread:

Myth 1: If you have extension sockets/bells, they can't be made to work

My Farther has 3 extensions that I wired in for him. So these won’t work once he’s potentially been upgraded .
Extensions can still work if you want them, the wiring just needs to be connected to the router/adapter rather than the exchange line master socket. The safest way to do so is to fit a 'slave' phone socket next to the existing master socket (but not connected to it) and transfer only the extension wiring to the slave, then use a double-ended phone cable (ie with a BT plug at both ends) to connect the slave socket to the router/adapter. There are other methods of varying degree of bodge - search for 'VOIP voice reinjection'.

Myth 2: You must get a special 'Digital Voice phone'
My mother-in-law was notified by BT back in January and she had her FTP line added in April. She, too, had to buy a digital landline phone.
Any phone with * and # buttons should work with digital voice (and indeed almost any British phone made since the 1920s will work with a pulse-to-tone adapter). If a new phone is needed, it does not need to be a proprietary 'Digital Voice' phone. I have managed to get all sorts of phones from the 1930s to the present day and extension bells happily working on VOIP.

Most ISPs will supply a router that has a phone socket at the back for the phone service: some will supply (or require you to buy) a separate Analogue Telephone Adapter (ATA - such as the Grandstream mentioned by Lucan). Both provide a socket that simulates a landline - though some have US-style RJ11 sockets that need an adapter (with a ringing capacitor) for BT plugs.

Older phones may not ring when plugged into some non-BT Digital Voice sockets. If so, they usually just need an adapter with a ringing capacitor - an old broadband 'filter' should do the trick.

There are two cases for dedicated digital phones: if your 'digital voice' is actually a standard SIP service, then a dedicated 'digital' VOIP SIP phone can be used instead of plugging a phone into an ATA; and BT's Digital Voice phones connect to their router directly.

Myth 3: If you don't have broadband, you'll lose your phone or need to get broadband straight away
Helpfully busted by philjo...
BT then switched us over to Digital voice. There is no change to the landline - the same phone works on the same cabling. It still works in a power cut as the phone has no power source at this end.
... who is the beneficiary of SOTAP for Analogue/pre digital phone line, the 'temporary' voice-only service that works just like a PSTN landline.

However, these are due to be around only until 2030. Otherwise, the intention is to provide a low-speed broadband connection and associated equipment good enough for calls only, at the same cost as a landline-only contract, as noted by m0ffy.

Myth 4: All remaining landlines will be switched off in January
As traditional copper networks face decommissioning by 2027 due to The Big Switch Off [Moneypenny]
As m0ffy notes, it is the BT PSTN exchange network not the copper network that is being closed. But even that is not the end of all landline services.

What is often forgotten is that many people (over 3 million) get a phone service from the exchange that is not provided by the BT/Openreach equipment that is being retired, and which is not necessarily being withdrawn in January. These "Local Loop Unbundled" services run over Openreach "Metallic Path Facility (MPF)" copper cables (available until 2030 at least), and are operated by companies such as Sky. They have their own, different, deadlines for withdrawal. Always check with your own provider!

Almost-certainly-a-Myth 5: you'll need a new number
Number portability is regulated, so it should be possible to keep a number. Any number that started on a BT line should be fully portable (even if it's a five- or four-digit number); others may be trickier but should not be impossible. If all else fails, porting the number to a separate VOIP service (eg A&A) may be possible, up to 30 days after 'losing' a number. In theory, numbers are no longer tied to exchanges on digital voice/VOIP either, so if you move house you should be able to keep the number.

Common assumption: A landline is a waste of money
Always puzzled me why society or the older generation have had mobile phones for years and still beem so obsessed with keeping a landline which is duplication.
I'm not ancient and I have a landline number over VOIP with fixed phones. My "older generation" parents also keep both. Why?
  • It doesn't cost much to keep a landline number (less than £2 a month with my provider)
  • It provides a number for the whole household rather than only one person
  • It provides a number that people do not expect to be answered all the time
  • It provides a 'local' number for business purposes which still looks more professional/permanent
  • Some of the numbers date back decades, so are in countless address books/contact lists, and directories
  • The Ageing Parents' hearing aids work better with the inductive couplers in the fixed phones
  • Fixed phones never get lost/accidentally migrate to one room in the house (something that became apparent when one of the APs ended up in a heap at the bottom of the stairs with all the phones upstairs - fixed phones were swiftly put back afterwards!)
  • Fixed phones don't 'go flat' (before anyone asks, yes, I have long battery back-up for the VOIP)
  • And, blast it, the mobile signal is unuseable here.
 

Lucan

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21 Feb 2018
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1,256
Location
Wales
Good information in this thread, much better than I have managed to find in the general media. My own ISP/phone provider (UNO) has given about zero advice apart from a recent email telling me I need to change to VOIP soon. They recommended I buy a Grandstream HT801 v2 as a ATA adaptor when I asked about it. Admittedly UNO are a more professionally oriented and expect you to know these things.
 

Devonian

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10 Sep 2019
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218
Location
Totnes
None of the BT/EE routers which support "Digital Voice" can do pulse dialing. There aren't that many VoIP ATAs that can do it either, certainly the Sipura/Linksys/Cisco line (which is popular and is used by BT themselves for business phone services) never could.
The Grandstream HT8xx series still do - though they are more fussy about the dial speed than the PSTN.
 

gg1

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2 Jun 2011
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2,487
Location
Birmingham
Common assumption: A landline is a waste of money

I'm not ancient and I have a landline number over VOIP with fixed phones. My "older generation" parents also keep both. Why?
  • It doesn't cost much to keep a landline number (less than £2 a month with my provider)
  • It provides a number for the whole household rather than only one person
  • It provides a number that people do not expect to be answered all the time
  • It provides a 'local' number for business purposes which still looks more professional/permanent
  • Some of the numbers date back decades, so are in countless address books/contact lists, and directories
  • The Ageing Parents' hearing aids work better with the inductive couplers in the fixed phones
  • Fixed phones never get lost/accidentally migrate to one room in the house (something that became apparent when one of the APs ended up in a heap at the bottom of the stairs with all the phones upstairs - fixed phones were swiftly put back afterwards!)
  • Fixed phones don't 'go flat' (before anyone asks, yes, I have long battery back-up for the VOIP)
  • And, blast it, the mobile signal is unuseable here.
Two more:
When someone leaves a message on a landline answerphone you're hearing their message live so if it's someone you actually want to speak to, you can pick up there and then. With a mobile where you listen to the message after the event you have to call them back.
No power supply required, so if you live in an area with both poor mobile reception and prone to power cuts (like the bungalow my dad lived in for 13 years), you still always have a phone. Sadly VOIP loses this advantage.
 

sor

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15 Nov 2013
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784
No power supply required, so if you live in an area with both poor mobile reception and prone to power cuts (like the bungalow my dad lived in for 13 years), you still always have a phone. Sadly VOIP loses this advantage.
BT and others will provide a free battery backup unit to customers that they know to be vulnerable. This is sufficient to ride out the typical power cut. Anyone whose property is "prone" to power cuts should be demanding that their local electricity company sorts things out.

BT and Virgin can also provide a phone that can switch to a mobile network if the landline goes down. It has its own battery backup. These units have an external antenna so may perform better than a typical mobile phone would in areas with otherwise poor reception.
 
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edwin_m

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Nottingham
No power supply required, so if you live in an area with both poor mobile reception and prone to power cuts (like the bungalow my dad lived in for 13 years), you still always have a phone. Sadly VOIP loses this advantage.
It's certainly true here and I believe it's universal, that the routers have battery backup, and if the mobile is registered with the home WiFi it will use that instead of the mobile signal. So you'd need a prolonged power cut to lose contact.
 

gg1

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2 Jun 2011
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Birmingham
BT and others will provide a free battery backup unit to customers that they know to be vulnerable. This is sufficient to ride out the typical power cut. Anyone whose property is "prone" to power cuts should be demanding that their local electricity company sorts things out.

BT and Virgin can also provide a phone that can switch to a mobile network if the landline goes down. It has its own battery backup. These units have an external antenna so may perform better than a phone would in areas with otherwise poor reception.
That's good to know.

In the case of the power cuts, they weren't specific to the property but affected the whole village. My dad's theory was the mains infrastructure hadn't been upgraded for decades and was unable to cope with modern demand (he lived there between 2000 and 2013).
 

WH241

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9 Mar 2025
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London
I recently called Sky to get a better deal as my broadband contract was ending. They moved my phone line across to internet calls and cut off the old copper call part of my landline so now the phone is plugged into the router. My broadband is part fibre so still uses copper into the property.
 

Devonian

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10 Sep 2019
Messages
218
Location
Totnes
It's certainly true here and I believe it's universal, that the routers have battery backup, and if the mobile is registered with the home WiFi it will use that instead of the mobile signal. So you'd need a prolonged power cut to lose contact.
Most customers' home routers do not have any battery back-up: they will shut down if a power cut lasts more than a few milliseconds, and take time to reboot after power comes back.

Some people manage to persuade telecom companies to supply battery back-up units (with a back-up time of one hour only as a minimum), but most people will have to buy their own if they want them, or want a longer back-up.

FTTC cabinets have some battery backup - but not very long; many (but not all) mobile masts and repeaters have a limited back-up; traditional phone lines and direct-from-exchange full-fibre connections have back-up to last days at the exchange and are the strongest links in the chain.
 

najaB

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Most customers' home routers do not have any battery back-up: they will shut down if a power cut lasts more than a few milliseconds, and take time to reboot after power comes back.

Some people manage to persuade telecom companies to supply battery back-up units (with a back-up time of one hour only as a minimum), but most people will have to buy their own if they want them, or want a longer back-up.
While that is true, backup batteries for routers are not expensive. You can get one that will provide an hour or two of backup power for under £30, which would be enough to get you though most power outages. Naturally, prices increase in line with capacity.
 

Friary Yard

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30 May 2022
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Devon
I had a lot of pressure from BT to change telephone equipment saying that my existing extensions would no longer work and that I must have a DECT Phone

I moved my internet to SKY and plugged my old telephone system into their hub without any problems at all including answering machine and several telephone extensions.

All my telephone equipment is over 10 years old.
 

sor

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I had a lot of pressure from BT to change telephone equipment saying that my existing extensions would no longer work and that I must have a DECT Phone

I moved my internet to SKY and plugged my old telephone system into their hub without any problems at all including answering machine and several telephone extensions.

All my telephone equipment is over 10 years old.
They're not completely wrong. BT does not recommend that you try to use your existing extension wiring and has no official way for you to do this. There's nothing stopping you DIYing it if you have the skills and can ensure that the outside line is completely disconnected from your extension wiring first.

Their preferred approach is to provide a "digital voice adapter" which plugs into the mains and can provide a phone socket anywhere it is needed, though they suggest this is better for devices that can't be plugged directly into the back of the hub such as a telecare device or wired phone that needs to be in another room. The DECT phone mentioned has its own advantages as it can make "HD voice" quality calls where available (such as to other digital voice users or to mobile phones).

I would be surprised if Sky are any different (though they won't supply any equipment other than the hub)
 

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