This sounds like a tie cable exists between cabs 4 & 19.
Thanks, could you explain in layman terms?
I'll try...
This is only a theory though, but it does fit in with the symptoms.
Typically, a cab is connected to the exchange with one or more cables. These are 'E-side' cables, as (viewed from the cabinet), they connect to the
Exchange.
From the cabinet, smaller cables radiate out to Distribution Points. These are the last points before the final connection to the premises and are usually either poles with a block at the top, or joints underground. These are 'D-side' cables, as (viewed from the cabinet), the connect to
DPs.
So, for most people the typical topology is:
Exchange -> E-side cable -> Cabinet -> D-side cable -> Distribution Point -> Drop wire -> Premises.
But as with many things, there are exceptions...
What
may exist in your situation, is for some reason, your premises couldn't be served like this.
I surmised this may have been a lack of capacity on the E-side cable to cab 19 - but it could be other reasons too.
To overcome this, the line was routed from the exchange to a different cabinet (cab 4), where a cable linking it to cab 19 ( a 'tie' cable) existed.
So your line may actually traverse 2 cabinets, not the usual 1.
e.g.
Exchange -> E-side cable -> Cabinet 4 -> Tie cable -> Cabinet 19 -> D-side cable -> Distribution Point -> Drop wire -> Premises.
If this is the case, the records and availability checker will likely show cab 4 as your serving cabinet, as this is where the E-side cable terminates, not cab 19, which is the more appropriate cabinet for your premises.
All this assumes the theory is correct though - which it may not be - It's supposition.
Assuming it is, if you are able to arrange for the routing of your line to be changed to an E-side cable that connects directly to cab 19 (and so missing out the 'intermediate' cab 4), the records would be amended and so the checker would update.
This isn't something that BT would do without some form of prompt ( such as an order/fault report), as they closed the issue once service was initially provided.
It may be that the simplest way is to order a new line with the hope that it's now possible to provide directly from cab 19, but you may be able to get your existing Service Provider to do what is necessary if the they have the will to do so.