MarkJTAllen wrote on Jan 13
th, 2006 at 3:03pm:
Perhaps my understanding is wrong. What I believed was that the 0845 number was paid for by the owner of the geo number, whatever that number may be, a call centre, a computer, a police station, whatever. The 0845 number is used to provide an unchanging interface for the customer, which can be modified ad-hoc on the owner side for whatever reason. It's a small but useful customer service. I believed that any charge involved was made by the telco to the owner for the mapping. [...]
There are a wide variety of telcos out there providing non-geographical numbers (NGNs, ie 0845/0844/0870 etc). They all [can] provide the same benefits, the difference being cost. If you search the internet you will find many suppliers out there, some who provide 0845 numbers at no extra cost. No extra cost to the receiver, that is. The caller pays extra and some of that call charge goes to the NGN telco.
So you can see that your call charges subsidise this routing service. I suppose those companies who pay to receive calls are getting a worse deal than those who don't on the same prefix. But then again, the facilities that the NGN provides may be different. You pays your money (or not, as the case may be) and you takes your choice.
NGN telcos can share some of those call charges with the company being called. 0870 is simply a higher priced version of 0845, thus you are more likely to find that companies don't have to pay for it [themselves], and often receive revenue payments. As an example, have a look at UK2Numbers' revenue payments for 0870
here. You will see that the more calls to the NGN, the more they will revenue share.
MarkJTAllen wrote on Jan 13
th, 2006 at 3:03pm:
[...] What OFCOM told me didn't totally support that, they said revenue sharing was possible, but would be highly unusual. As distinct of course from the numbers known to be revenue generators.
Generally speaking, the higher volume of calls through a number, the more revenue NGN telcos share with their customers (ie the company being called), as in the example above. The volume of calls is obviously very high with dial-up internet services, especially compared to voice services (call centres). So they can get paid for getting calls coming through their 0845 numbers.