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Vintage Telephony and Telecomms Vintage Telephones, Telephony and Telecomms Equipment |
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13th May 2020, 10:11 am | #41 | ||
Pentode
Join Date: Jan 2019
Location: Manchester, UK.
Posts: 163
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Re: The space in the STD codes
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13th May 2020, 10:55 am | #42 |
Nonode
Join Date: Sep 2017
Location: Stockport, Cheshire, UK.
Posts: 2,005
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Re: The space in the STD codes
I did read about a court case where someone was caught chain dialling, but the GPO lost the case because the judge said they hadn't done enough to safeguard the system.
I can't quite remember the details.
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13th May 2020, 11:21 am | #43 | |||
Heptode
Join Date: Jul 2007
Location: Flintshire, UK.
Posts: 707
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Re: The space in the STD codes
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13th May 2020, 11:45 am | #44 | ||
Dekatron
Join Date: May 2008
Location: Derby, UK.
Posts: 7,735
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Re: The space in the STD codes
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13th May 2020, 9:50 pm | #45 | |
Heptode
Join Date: Jul 2007
Location: Flintshire, UK.
Posts: 707
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Re: The space in the STD codes
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A Group Switching Centre would have a number of incoming routes which were restricted on what they could dial out to. For instance dialling from Chester (0244) to Wrexham was 93 which was barred from incoming STD calls. When it arrived in Wrexham, it wasn't possible to dial other GSCs by dialling 9X which were not within the Chester local call area such as 94 for Oswestry (0691) 30 odd miles from Chester or 96 for Whitchurch (0948) 20 plus miles from Chester. There was a way around sometimes by dialling a local code 81 from Wrexham to a dependent UAX such as say Ruabon UAX14, the dialling a 9 back to Wrexham GSC followed by the 93 for Oswestry. Ruabon of course was allowed access to Oswestry. But speech got fainter and fainter the further you went. Pre-STD, dependent UAXs also had 'call barring' on some of their outgoing junctions achieved by strapping in the junction relay set. Also both pre/after STD introduction, the outgoing 'local' access was limited by 'grading' on the incoming selectors. To say the GPO didn't make the effort to prevent the fraud wasn't quite true - ill informed prosecuting lawyer! There certainly were successful cases, the big one in Bristol (?) where the engineer had 'modified' the exchange to get free calls by dialling a certain code which gave NU tone but you ignored that and just carried on dialling but meter pulses weren't sent back to the callers line meter. I believe it was held at the Old Bailey in London. |
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15th May 2020, 5:55 pm | #46 | |
Triode
Join Date: May 2014
Location: Worcestershire, UK.
Posts: 37
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Re: The space in the STD codes
[QUOTE=pip5678;1246433][QUOTE=198 kHz;1245390]
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Someone ^^ mentioned the futility of chain dialling when the transmission was so faint. It was, of course, but it was mainly "because you can". A good wheeze from a payphone was to dial out to a UAX, then "0" for the operator. This meant the lamp on the operator's board was white, and not red as it would be for a payphone. Hence one could ask for any number and it would be ticketed to the payphone. The vertical marking banks (VMBs) were eventually re-strapped to prevent this. |
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15th May 2020, 8:08 pm | #47 |
Octode
Join Date: Nov 2011
Location: Manchester, UK.
Posts: 1,875
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Re: The space in the STD codes
Thanks for that. I live on the edge of 881 and 236, and now I can see why
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15th May 2020, 9:57 pm | #48 | |||
Pentode
Join Date: Jan 2019
Location: Manchester, UK.
Posts: 163
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Re: The space in the STD codes
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