Slam / Slamming
An end user that is PICed (having your long distance carrier switched) without their permission. An RBOC Slam Fee must be paid for each slam.

State and Local Taxes - Aka: Gross Receipts Tax Surcharge, Interstate Tax Surcharge, State Universal Service Fund
State and local governments assess this charge in different ways and at different rates. Proceeds go to the local governing body. It can be imposed on the revenues of local telephone companies, and long-distance companies operating within a state. Although these taxes vary by your location, they are the same for all providers serving that area. For more information about these taxes, please contact your local and state tax offices. You can find their number in the government section of your local telephone directory.

State Universal Service Fund - See State Universal Service Fund .

Subscriber Line Charge - See Federal Subscriber Line Charge .

SLC - See Federal Subscriber Line Charge .
The long distance company that is automatically accessed when a customer dials 1+.