Busy line interrupt

#	Item
1	Model Call Flows for Operator Interface Version 2.0 Model Call Flows for Operator Interface Version 4.0 Add to Reading List Source URL: www.crtc.gc.ca Language: English - Date: 1997-05-02 16:25:46 Telephone exchange Busy line interrupt
2	R746. Public Service Commission, Administration. Add to Reading List Source URL: www.rules.utah.gov Language: English - Date: 2014-07-15 15:24:04 Telephone numbers Operator assistance 9-1-1 Toll-free telephone number Telephone call Automatic number identification Local exchange carrier Busy line interrupt Telephone operator Telephony Electronic engineering Telecommunications companies