NEC NDA-24305 - page 268

CHAPTER 6 NDA-24305
Page 25 0
Revision 1.0
CALL COMPLETION TO BUSY SUBSCRIBER (CCBS)
3. Service Conditions
1. CCBS is available when an end-to-end lin k i s e stablished via Q-SIG interfac e (ET S 300 172).
2. The transfer rate is 64 kbps . Bearer Capabilities are as follows:
– Speech
– 3.1 kHz audio
– 7 kHz audio
3. Multiple CCBS features cannot be set for a single station.
4. CCBS is available for the Dterm or an analog station (Attendant Console and ISDN termi nal cannot be used) .
5. When the called station number is Pilot Number of Station Hunting Group, CCBS is set to the terminated
station.
6. When Call F o rwarding – A l l Calls is activat e d at the called s tation, CCB S is set to the forwarded station.
7. When Call Forwarding – Busy Line is activated at the called station and the forwarded station is also busy,
CCBS is set to the called station.
8. CCBS is not available while one of the following features is activated:
• Call Back
• Call Back – CCIS
• Call Waiting
• Call Hold
• ATT Camp On (Called side)
9. CCBS is canceled wh en:
• Cancel Timer for CCBS expires.
• All the trunks for recalling are busy.
• The system recalls the calling station in lockout or make busy state.
• The called station is abnormally released (ex. the handset remains off-hook) and turned into lockout
state.
10. CCBS conforming to IS-13870 is available when an end-to-end link is established via IS-11572 interface or
when the tandem connection of Q-SIG and IS-11572 link is established (Not available for the signaling
method other than Q-SIG and IS-11572).
11. The transfer rate is 64 kbps. Bearer Capabilities are as follows:
- Speech
- 3.1 kHz audio
Note: For more det ails a bout t he CCB S fea t ure regulated by protocol, see the corresponding manual.
12. CCBS is available for the Dterm or an analog station (i.e. not available for PS terminal, Attendant Console
nor ISDN terminal).
13. CCBS can be set only when the called station is in two-party connection or busy condition and the call is
not completed for the called user busy (fault cause is #17).