4.3.4.5 Completion of Calls to Busy Subscriber (CCBS)—by QSIGDescriptionIf the call has been made to an extension in another PBX in QSIG network and the called party is busy, anextension user can set to receive callback ringing when the called party becomes free. When the user answersthe callback ringing, that party’s number is automatically dialled.Conditions• This feature complies with European Telecommunication Standard (ETS) specification ETS 300 366, Callcompletion supplementary services.• This feature is available under the following conditions:a. The caller’s PBX is capable of using CCBS.b. The called party’s PBX is capable of accepting CCBS.• To receive and send CCBS, receiving and sending CCBS must be enabled individually on an ISDN (QSIG)port basis through system programming.• An extension user can set only one CCBS. The last setting is effective.• The CCBS setting is cancelled if there is no callback ringing within 60 minutes or callback ringing is notanswered within 10 seconds.PC Programming Manual References9.26 PBX Configuration—[1-1] Configuration—Slot—Port Property - BRI Port—Supplementary Service—COLP, CLIR, COLR, CNIP, CONP, CNIR, CONR, CF (Rerouting), CT, CCBS, AOC-D, AOC-E, 3PTY9.27 PBX Configuration—[1-1] Configuration—Slot—Port Property - PRI Port—Supplementary Service—COLP, CLIR, COLR, CNIP, CONP, CNIR, CONR, CF (Rerouting), CT, CCBS, AOC-D, AOC-E, E911, 3PTYUser Manual References1.2.4 When the Dialled Line is Busy or There is No Answer446 Feature Guide4.3.4 QSIG Standard Features
