Dacs lines

So our remaining landline (with talk talk - was po/shell/octapus brought and sold) has been ported over to voip (finally) and as some of you already know its a dacs'd line. When the number was ported, the line changed number and was still active (17070 works) but you can't call the new number. Is this normal or should i inform talk talk.

Same with my old landline when I ported it to VoIP about 3 years ago. There was a new number on the copper pair, but you couldn't call it (or call out on it). Don't know if it was DACS, but from the quality I doubt it. The was a WLR line via Zen.

my non dacs'd line when i did the voip transfer last year just went dead but that had fttc on it.

If it's a DACS line then you can't possibly be doing broadband over it, so you should just treat it as no longer existing (just make sure Talktalk aren't billing you any more).

I expect all DACS equipment will be decommissioned as part of PSTN switchoff, which was due for Dec 2025 but pushed back to Jan 2027.

That's a TalkTalk thing rather than a DACS or porting thing. I wouldn't worry about it. TalkTalk used to have the same different number issue when they were in pre-provide state.

Edited by FibreBubble (Fri 30-Aug-24 10:02:11)

I doubt there are many DACS left now. I did a lot of work on recovering DACS on an exchange by exchange basis about 10 years ago.

It’s extremely unlikely that the line was DACS ( digital access carrier system ) , even in the mid 1990’s DACS was problematic with 56Kbs modems , let alone broadband, and TT being a LLU/MPF provider, DACS was never compatible….DACS was ‘invisible’ from the end users point of view, so its removal would not be noticeable, the end user not notified of its removal, there was no need for that level of customer engagement, DACS was only ever a telephony solution to a copper pair shortage, broadband effectively killed off DACS decades ago .

As fas as a stopped line , retrieving a number ( via 17070 ) that is unrelated to the customer (, and doesn’t accept incoming calls ) , is pretty normal on a stopped line , to allow a port of the original number the ‘line’ is stopped and renumbered, the idea being that should service be required over it again ( fairly academic with PSTN switch off ) the line is ‘start/renumbered’ .

The line may quickly go ‘dead’ , if a cease order is raised , however these are ‘BT’ protocols , if the line were TT LLU , they may do something similar.

Edited by Iniltous (Fri 30-Aug-24 10:08:30)

In reply to a post by Taras:

When the number was ported, the line changed number and was still active (17070 works) but you can't call the new number. Is this normal or should i inform talk talk.

Probably means your line is wired to a TalkTalk DSLAM / MSAN at the exchange, rather than an Oprenreach/BTwholesale DSLAM. Ignore it.

Multiple engineers over the years have stated it was dacs. There was an engineer as late as june/july (can't remember when now) who didn't believe me when there was a fault on the line. He came back saying "yep the line is dac'd "

talk talk have taken over everything that was post office (non llu) that went to shell energy .. so i doubt talk talk moved non vdsl lines over to the llu side