Can you give us some more information on this system: Specifically what company provides the system? For example, Dog n Bone Zone and Keycom/Keytalk are two university phone names I know of. Is there a website for this service? Roughly how many rooms/extensions are we talking throughout the university
that will have these 0870 numbers?Does a number appear on the caller display of the person you're calling? When you dial out, try prefixing the outside number with 1470. On a normal telephone line this will allow the number to be shown, where it would otherwise be perminantly withheld. I don't expect it to work, but it's worth a try.
Before you try anything, bear in mind that there's no guarantee that the geographical number is an 01482 number and/or that there is an underlying geographical number at all.
Numbers beginning 0870 855 are allocated to
Your Communications (change date 08/2003).
Within the 01482 code there is only one prefix allocated to Your Communications and that is 01482 25 (change date 05/2002). There are no numbers allocated to
Thus Plc, YC's parent company.
I must point out that the geographical and 0870 numbers could be allocated to different telcos. More information on the system in question might help us identify the number better.
If you want to try these numbers, start off with 01482 25 followed by the last four digits of the internal extension number. If the last four digits of the 0870 are different to the last four digits of the internal extension number, then I would be inclined to put my money on the last few digits of the 01482 number being the same as the internal number. That's not forced to be the case, but I think that when we have successfully found numbers for these systems, they have been linked to the internal ones, rather than the 0870s.
If that doesn't work, then I suggest that you try the following:
01482 250xxx
01482 251xxx
01482 252xxx
01482 253xxx etc
Substitute xxx for the last three digits of your internal/0870 number.
Failing that, it might be that only the last two match, so you will have to try:
01482 2500xx
01482 2501xx
01482 2502xx
01482 2503xx etc
If you do get through to someone, you could ask them whether they are in university accomodation and what their internal number and 0870 is. That way, you might be able to work out how the two relate to one another.
I don't think you'll find any are residential as they'll all be KC numbers (which these aren't), so most will probably be out of service.