List of USOCs
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A universal service order code, more commonly known in the industry as a USOC, is an identifying code used in telephony, such as for telephone equipment and calling features. USOCs were introduced by the Bell System in the 1970s[1]) as a standardized way of referring to service information within (and often between) telephone companies. While many of the most common USOCs are well-standardized and have a ubiquitous meaning, some USOCs have been introduced and are used regionally or locally by specific providers, such that the same feature may go by different USOCs between multiple companies.
List of service USOCs
| USOC | Feature Name |
|---|---|
| 1FR | 1-party flat-rate residential service[2] |
| 1FB | 1-party flat-rate business service |
| 1MR | 1-party measured rate residential service |
| 1MB | 1-party measured rate business service |
| 2FR | 2-party flat-rate residential service |
List of common feature USOCs
| USOC | Feature Name |
|---|---|
| CPU | Call Pickup |
| EAB | Call Hold |
| ESC | Three-Way Calling |
| ESM | Call Forwarding (Variable) |
| ESX | Call Waiting (Terminating) |
| EVB | Call Forwarding Busy |
| EVD | Call Forwarding Don't Answer |
| HMI | Home Intercom |
| LNQ | Last Number Redial |
| NNK | Caller ID Deluxe (Name and Number) |
| NSD | Caller ID Basic (Number) |