There isn't much about Masterpoint on the web, only this:
http://www.interquartz.co.uk/case_study_3.htmlhttp://www.masterpoint.co.uk/partners.phpThey do say:
Quote:we also have direct relationships with selected providers of Network Services BT, RELY and C&W.
Cable & Wireless have 13 numbers in Glasgow:
0141 160 *
0141 232
0141 246 *
0141 300
0141 302-309 inclusive
0141 314
0141 446 *
* these codes were only allocated in September 2004. I think it's a brand new system, but even so this seems too recent.
BT have very many more, but if you're desperate you can find them here:
http://www.ukphoneinfo.com/search/Phones/oftel_cl_sab_141.htmlOf course, it could use voice over IP, but they do seem to specialise in old-style exchanges.
Also, what number does the caller-ID give (or 1471) when you call someone? Is it a 0141 code or something else? In Southampton, it was found to give a Winchester code, and this lead straight to the numbers!