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NEAX2400 IPX ISDN Features and Specifications
Page 148
NDA-24311, Issue 1
C-148 Call Completion to Busy Subscriber (CCBS)
Service Conditions
1. This service is provided in the network where the Q-SIG link is established between ends: it cannot be
done using the other signaling systems.
2. This service is activated on the basis of SS-CCBS provided by ETS 300 366.
The methods are as below:
• Path Reservation: non reservation method or path reservation method (selectable)
• Retention of signaling connection: connection retention method
• Service retention: service cancellation method
3. Information transfer specifications are as follows:
• Information transfer rate: 64 kbps
• Information transfer capability: voice, 3.1 kHz audio, 7 kHz audio
Conditions of a calling party
1. This service cannot be set when a calling station is:
• activating Call Back [C-1] or engaged in Call Back
• activating Call Back - CCIS [C-44] or engaged in Call Back - CCIS
• activating Call Hold [C-6]
• restricted.
2. A calling station may set CCBS only just after disconnection as a result of a called station busy.
3. This service can only be activated from D
term
s or analog stations. It cannot be done from the Attendant
Console or I interface terminal.
4. If CCBS Call Back is not answered within 30 seconds (flexible by no-answer timer), ringing stops and
CCBS is cancelled.
5. A station cannot activate CCBS to more than one station at a time. Multiple CCBS is not allowed. The
number of simultaneous CCBSs per LP is:
480 (max. number of calls) – (number of ISDN calls caused + number of CCBS under transaction).
6. CCBS is not activated if a calling station is in the Line Lock Out or Make Busy status when called back.
However, if that station is called back after returning to the normal status, CCBS may be activated.
7. If all the trunks for Q-SIG are busy (if there are no idle trunks) when a setting station is called back, CCBS
is not activated and cancelled.
8. The following are the conditions when the path reservation method is used.
a.) If no answer returns for the path reservation requirement within 30 seconds, CCBS is cancelled.
b.) If an error message returns for the path reservation requirement, each of the following operations
is made:
remote User Busy Again : waiting for the called station to become idle.
failure To Much : CCBS is cancelled
failed Due To Interworking : CCBS is cancelled
unspecified : CCBS is cancelled
others : CCBS is cancelled