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A vertical service code (VSC) is a sequence of digits and the signals star (*) and number sign (#) dialed on a telephone keypad or rotary dial to enable or disable certain telephone service features. Some vertical service codes require dialing of a telephone number after the code sequence. On a touch tone telephone, the codes are usually initiated with the star key, resulting in the commonly used name star codes. On rotary dial telephones, the star is replaced by dialing 11.
In North American telephony, VSCs were developed by AT&T Corp. as Custom Local Area Signaling Services (CLASS or LASS) codes in the 1960s and 70s. Their use became ubiquitous throughout the 1990s and eventually became a recognized standard. As CLASS was an AT&T trademark, the term vertical service code was adopted by the North American Numbering Plan Administration. The use of vertical is a somewhat dated reference to older switching methods and the fact that these services can only be accessed by a local telephone subscriber, going up (vertically) inside the local central office instead of out (horizontally) to another telephone company.

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  1. R

    Unvented cylinder notification.

    How do we notify building control? I tried on Gas Safe notifications but there is nowhere on the notifications menu for just a direct unvented cylinder (not gas).
  2. Robert Tyrrell

    New one for me

    I've been given a job by a builder working on an insurance claim and I have to re-install an oil tank and re-connect the tank & boiler, which I can do without too much of a problem but, haven't done before. My main concern is the local BC; do I have to notify them regarding this? If so when? The...
  3. C

    new unvented tank should the plumber notify building control?

    had a unvented hw tank fitted. should the plumber have notified building control? if so how can I check?
  4. plumb_know

    unvented card but not registered with scheme- what am i legally allowed to do?

    Hi every one, just seeking your experience and knowledge again all comments appreciated in advance. As title saids i obtained a bpec unvented hot water card whilst doing my apprenticeship, it is still in date and carried out maintenance work whilst employed by the company who put me through...
  5. S

    Too Late to Notify ?

    Had a customer ring this morning who is looking to move and needs their Gas Notification certificate but doesn't have it :( Checked my GSR account and it looks like i forgot to do it at the time.......... which was April '08.... Oops !! Just been onto GSR site and tried to notify it...
  6. A

    Do you have to notify gas safe every time you do a landlord cert?

    Hi, Can someone tell me if you need to register or notify gas safe everytime you do a land lord cert or if it is just for new appliances? Thanks
  7. J

    register unvented cylinder

    Hi ya guy and girls, I've recently past my unvented course and done my first cylinder, i'm struggling to find how to register it? :crazy: regards john
  8. A

    How long have you got to submit notifications?

    I have just found a cpl from the beginning of the year that I have not submitted.... Is there a penalty for this? :banghead:
  9. B

    Gas Safe register - Online Notification

    Hi, I have been trying to notify some appliances with GSR online & have run into dificulty :( Admittedly I have saved them up for a while so thought i had better notify them now. What happens is :- The process all goes well & the notifications are all done sitting there waiting for payment...
  10. D

    Moving an unvented cylinder, should I notify it with building control via Gas Safe?

    The title says it all. I'm moving an unvented cylinder from a house, to a anex that has been built for the property. At some point I will be installing a new heating system with a new cylinder back in the main house. Which I will notify to building control via Gas Safe. Do you guys think I...
  11. M

    Notify LABC of new boiler?

    Okay, so I've had my new boiler installed and commissioned. Do I now need to notify the LABC to get a Building Regulations Compliance Certificate? If so, how do I go about this?
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