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NDA-24305 CHAPTER 6
Page 251
Revision 1.0
CALL COMPLETION TO BUSY SUBSCRIBER (CCBS)
14. CCBS is not available while the calling and called station is in one of the following conditions:
(a) Calling Station
• the station sets Call Back or Call Back is set to the station
• the station sets Call Back-CCIS or Call Back-CCIS is set to the station
• the station uses Call Hold
• the station sets Call Waiting service
• the station is restricted this feature
(b) Called Station
• the station is in lockout state or make-busy state.
• the station sets Call Back or Call Back is set to the station
• the station sets Call Back-CCIS or Call Back-CCIS is set to the station
• the station uses Call Hold
• the station sets Call Forwarding-All Calls/Busy Line (providing that these C.F. services are
complete)
• Attendant Camp on with Tone Indication is set to the station
• the station sets Call Waiting service
• the station is restricted this feature
15. CCBS is canceled when:
(a) Automatic Cancel Timer for CCNR expires (ASYD, System data 1, Index 71, b0-b3 decides the timer
and b7 makes the timer effective).
* Automatic Cancel for Call Back is applied to this feature also.
(b) No Answer Timer (calling station does not answer the CCBS recall) expires (ASYD, System Data 1,
Index 139. Default data is 30 seconds).
(c) The system recalls the calling station in lockout or make-busy state (CCNR is effective when the
calling station is called after lockout state or make-busy state is recovered).
(d) All trunks for recalling are busy at the time of recall.
(e) The called station is abnormally released (ex. The handset remains off-hook) and turned into lockout
state.
(f) The calling station (operating station) is restricted incoming calls at the time of recall.
16. The single station cannot set multiple CCBS services and multiple CCBS services cannot be set to the single
station.
A maximum number of CCBS to be set simultaneously per LP =
480 – (no. of ISDN call to be handled + no. of already set CCBS and CCNR service
Note
)
Note:
Both CCBS and CCNR services conforming to ETS300 366 and IS-13870.
17. When the called station becomes idle while the calling station is in conversation, the system recalls the
calling station after the conversation ends.
18. Sub Address-Addressing is not used with CCBS.
19. If the fault occurs at IS-11572 data link when;
(a) If the fault occurs when the calling station is operating to set CCBS, CCBS service cannot be set.
(b) If the fault occurs when the calling station is operating to cancel CCBS, CCBS is canceled at the side
of operating station but not canceled at the side of called station since the cancel message is not sent
to the station.