| 1. | Clec competitive local - exchange carriers 具有竞争力的本地交换运营商 |
| 2. | Ecsa exchange carriers standards association 交换信号标准协会 |
| 3. | Clec competitive local exchange carrier 竞争的本地交换载波 |
| 4. | Competitive local exchange carrier 竞争本地交换运营商 |
| 5. | Ixc inter - exchange carrier 长途交换运营商 |
| 6. | Logical exchange carrier lec 逻辑交换载体 |
| 7. | Lec local exchange carrier 本地交换载波 |
| 8. | Inter - exchange carrier 长途交换运营商 |
| 9. | Local exchange carrier 本地交换电信局 |
| 10. | Rules that a lec ( local exchange carrier ) employs to redirect a call that encounters a busy or no answer 当呼叫遇忙或无应答时, lec (本地电话公司)使用该规则重新发送呼叫。 |