04.933GPPCompletion of Calls to Busy Subscriber (CCBS)Stage 3TS
For the purposes of the present document the following definitions apply.
Subscriber A: The user of MS A, requesting CCBS.
Destination B: The entity addressed in the original call set up, which is busy when first called by subscriber A.
For the purposes of the present document the following abbreviations apply:
CCBS Completion of Calls to Busy Subscriber
MS A Mobile Station of subscriber A
NDUB Network Determined User Busy
Further related abbreviations are given in GSM 01.04