@sevenlayermuddle
I am not being unfair to India or anywhere that is the country of 'operation' of these Scammers.
Note: I say operation because it is quite likely that the bodies on the phones are NOT gaining even 0.1% of the money made.
It is outside agencies related to criminal gangs often, but not always, from eastern European countries where the gangs have power and influence BUT a limited 'pocket' to dip into.
They are simply making their monies wherever they can take advantage of desperate people and social inequality.
Modern technology makes it easy to globalise your operations and make it more difficult to track/trace the real profiteers.
I understand what you are saying in terms of the difficulty but as you will know from your very real experience the information should be there to find.
Only,
if the equipment is not something that has been 'hacked' to work around the built-in capabilities of the kit/system.
The fact that someone can easily connect 'hacked' kit that cannot be tracked/traced is down to the lack of control of the Telcos.
There is not an alternative that can be used at equal low cost and effort, so the Telcos hold all the cards and could impose better control.
Yet, they allow the scammers to get their own way and apparently so easily evade monitoring.
This is simply down to a
lack of will ...... no more no less. (The question is why ?)
The imposition of onerous controls would be seen as a risk to business and profits.
This is because, as the Telcos are NOT working together to solve this problem, any lost customers will simply go to another Telco who is less choosy and asks less questions.
(That Telco could be in ANY country because of the reciprocal agreements for interconnectivity etc)
The problems are of their own making and the cut-throat selling attitudes are not aiding the resolution in any way.
Hence my opinion that the Telcos including BT are prepared to accept the situation because profit is more important than anything else.
They are fulfilling their obligations to their shareholders at the cost of everyone else.
Nothing is illegal, so the government can only ask nicely for some action but BT are not obliged to do anything.
In terms of foreign Telcos doing anything there is even less leverage, unless BT applies pressure via the reciprocal agreements they have for interconnectivity etc
Once again such action would be seen as a risk to profits due to the possibility of 'Tit for Tat' responses, so no action there.
The only way to impact this problem is by ALL the Telcos working together, with a joint will to eradicate the problem.
Herding Cats comes to mind, but that is probably much easier.