Setting up phone on new router

[wjsd7]

Recently I had to purchase a new router, a tp-link Archer VX1800v. The router connects to the internet fine, but I'm having trouble setting up telephony. In the box after my phone number I need to provide the "Registrar Address" as far as I can tell, this is a domain, but I'm told from customer support that they don't have this information. This can't be true, can it? My current Sagemcom router has developed a fault, it won't save settings after shutting down and takes ages to connect to the internet on reboot, approximately half and hour. 

Can you please provide this information so as I can set up the phone on the new router?

• Telephony Provider: Other

• Phone Number: Enter your phone number.

• Registrar Address: Enter the Domain you received in the 'Service Credentials' email.

• Authentication ID: Enter the AuthID you received in the 'Service Credentials' email

• Password: Enter the SIP Password you received in the 'Service Credentials' email.

[nambuso-TT]

Hi there

@Gliwmaeden2 @ferguson @Billx Thanks for advising.

@wjsd7 I am very sorry to hear this. Please do try to contact us the number provided once again and do let us know us how it goes. Thanks 

[wjsd7]

That's quite incredible that I would have to pay an independent provider to use the phone on this router. Again, I'm baffled that TalkTalk/BT/EE can't, or won't provide this information. They configured the Sagemcom, so, obviously the Registrar Address (domain) required for VoIP isn't a mystery, someone in the company can provide it. I wonder what their reasons are for this? For the time being I'll reconnect the Sagemcom to make calls and after contract think about switching to a different ISP. Not something I want to do as I've been happy enough with TT for 15 years now. I just want to use a router of my own choosing. I'll try one more time to call the support number today. 

[wjsd7]

Yes, 2023 would be correct. I didn't want an eero and requested the Sagemcom instead. I returned the eero, new router was sent, but it was stolen, the delivery person left it on the ground floor by the lift door as proven by CCTV footage. Eventually received a replacement. 

As mentioned previously, not terribly happy with the Sagemcom. This recent problem, though, happened a couple of months ago when I left my computer running over night. When I got up the next day I found I couldn't log in to the router, the password had changed to the default. I was suspicious so did a full reset of router. Since then the router will not save the login password after being switched off and takes a long time to connect. I've done numerous resets since then, but with the same problem recurring. What I did notice, however, the GUI is slightly faster and more responsive than before, very odd indeed. Perhaps a firmware update changed or broke something in the Sagemcom, I have no idea. Basically, I want to use a router of my choice. I’m currently connected to the internet using the Archer VX1800v, no problem at all, except VoIP is not working due to information required. See link.

https://support.myowntel.net.au/hc/en-us/articles/8222749604879-Configuring-Your-TP-Link-VX230v-AX18...

Although that is for a different ISP, TalkTalk obviously have these details. It’s just a matter of finding the department that can provide it.

[Billx]

The following is an example of an Amazon customer's  comment on Amazon, on the Amazon video referred to above, by the OP:

---

PD Digital Home Phone service,

Reviewed in the United Kingdom on 14 August 2025

works very well , but if your on BT/EE and want to use VOIP, you will have a problem, digital home phone compatibility.
If you have EE’s Digital Home Phone service, you'll need to use your EE or BT hub as your primary router. There is no way of getting information from EE that you will need to configure this router on EE/BT. Works okay on broadband fine , and you do get dial tone on the phone port, but it will not work. So, if you need that part of the service, you are out of luck. I have been on to TP link and they are "as much use as a handbrake on a canoe,"

---

The same would apply with TalkTalk

I would say, to use the VOIP service on this router, one probably has to use an independent SIP service.

[ferguson]

I can't answer that. The only suggestion I can make, other than justifiably ask for a replacement Hub, is to raise a complaint in the hope that it reaches a level where someone can actually deal with that question. In which case I am sure many others would also be pleased to know! 

[wjsd7]

Hi ferguson,

I think I would have to agree with you there, however, they should have a basic knowledge of their voIP service. To be honest though, I wasn't really happy with the Sagemcom in general, the GUI was really slow and there's really a lack of options that you would get in a third party router. But mainly this recent problem with turning the router off and everything returning to default, not to mention that it takes ages to connect now, up to half an hour, previously it only took about a minute to connect when booted up. So, one simple little thing stands between me using this new router with my phone: Registrar Address. How is it that this detail is so hard to acquire? I'm baffled.

[Gliwmaeden2]

@wjsd7, is the ailing router the Sagemcom that was sent out to you just in May 2025?

https://community.talktalk.co.uk/t5/Full-Fibre/Still-waiting-for-a-router/td-p/2973109

You should definitely simply have reported it, if that's the case - it should be well within its warranty. 

Definitely worth asking the Full Fibre support agents for help with that.

Edit: looking closely at the post about a previous router, it looks like you originally posted about it in May 2023! But it then entered the workflow dated May 2025 and has two replies from the current support team from just last year.

Very odd. Please clarify the history of the routers!

[ferguson]

@wjsd7 

I fear you are whistling in the wind. I am not sure that anybody at TalkTalk support is actually aware what the VoIP settings are, to which their own Hubs are specifically configured. Is there any particular reason why you opted to buy a third-party router, rather than seeking a replacement for your seemingly faulty Sagemcom? 

[Gliwmaeden2]

Staff will be back on here  c 7am till 5pm tomorrow, @wjsd7, but you might be better phoning again [closes 7pm] or trying Chat [closes 9pm] as there's nothing forum support staff can do with Full Fibre issues [of which VOIP is a part].

[wjsd7]

For reference, here is a video that shows the settings I need to fill in https://youtu.be/0Jka1J9d4Mk?t=387

Not the same router as mine, but the settings are pretty much the same. If TalkTalk can provide these details it would be cheaper than sending me an entirely new router. 

[wjsd7]

That number just sent me a text to login to the service centre https://support.talktalk.co.uk/

It tells me that my network status is good, including phone which is now connected to the Archer VX1800v. All I hear when I pick up the phone is a solid tone, not the usual dial tone. When I click on "my router" it still thinks I'm using the Sagemcom-FAST5464, but I'm not. 

[nambuso-TT]

Okay I understand and I am very sorry for that, Please do contact that number. Should you require any further assistance, please do not hesitate to contact us. Thanks

[wjsd7]

Thanks nambuso, I will try that number next. 03451720088 were unable to provide any information. Manufacturer states on the box that it's compatible with BT, TalkTalk etc. A reviewer on Amazon said that it works with TalkTalk. I'll see what support says on that number you gave me, otherwise, I'll need a replacement router.

[nambuso-TT]

Hi there @wjsd7.Thank you so much for getting in touch. Looking into your account I can see that you are a full fibre customer and to get more information regarding this, I would suggest that you contact them directly using the below number: Contact Number: 03451720074  

Opening Hours: 

VOICE - Mon-Fri: 9am-7pm; Sat: 9am-6pm; Sun: closed

WEB MESSAGING - Mon-Fri: 8am-9pm; Sat: 8am-7pm; Sun: 9am-7pm

Alternatively, you can use the below live chat link:

https://community.talktalk.co.uk/t5/Articles/Our-live-chat-team/ta-p/2230529

[Gliwmaeden2]

If it's a third party router, not sure if Talktalk's VOIP will work with it, @wjsd7.

It might have been better to get the Sagemcom router checked out / replaced  rather than purchasing the other router.

Interested to see what staff say, as this could be a scenario that also affects other customers.