Universal Resource Locator (URL) | An address on the World Wide Web. Known as URL.
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Universal Service Order Code (USOC) | Three-to-five character alphanumeric codes found in the Service and Equipment
(S&E) Section of a service order. These codes are used to describe a particular
product, service or data element. (For example, the USOC "ESX" represents
POTS call waiting.)
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User Agent Client | A user agent client (UAC) is a client application that initiates the SIP request. |
User Agent Server | A User Agent Server (UAS) behaves similarly to redirect servers, except that they also accept requests and can return a response of class 2xx. |