GSM calls released by many reasons and all reasons explanation has been dedfined as per standard by ITU. this document contains all those cause values and expalnation.
DONE
GSM originate call
call dropFull description
Silent Call
UMTS-WCDMA Technolog
call centerFull description
chart call flow
Callsetup
Makalah Sistem Operasi Komputer
Sales techniqueFull description
it&c
Call centerFull description
Handbook of Tactical Combat Casualty Care Lessons LearnedFull description
Thesis on impact of repeater on GSM Networks (Portuguese doc)
27) PROVIDE ROAMING #
MOBILE to MOBILE
VLR VLR
30) SEND INFO I/C CALL SETUP
6) AUTHENTICATE
39) PROCESS ACCESS REQ
9) AUTHENTICATION RESPONSE
40) AUTHENTICATE
10) SET CIPHERING 15) PROCESS ACCESS ACCEPTED
43) AUTHENTICATION RESPONSE
44) SET CIPHERING
BSS BSS
51) TMSI ACKNOWLEDGE
ORIG
16) FORWARD NEW TMSI
49) PROCESS ACCESS ACCEPTED 50) FORWARD NEW TMSI
HLR HLR 5) PROCESS ACCESS REQ
31) PAGE
TERM
28) RESULT ROAMING #
19) TMSI ACKNOWLEDGE
GMSC MSC
21) SEND INFO O/G CALL
BSS BSS
22) COMPLETE CALL
52) COMPLETE CALL 26) SEND ROUTING INFO 34) PAGING REQUEST
33) PAGING
1) CHANNEL REQ
29) ROUTING INFO ACK
35) CHANNEL REQUEST
2) IMMEDIATE ASSIGN
36) IMMEDIATE ASSIGN 37) PAGING RESPONSE
4) COMPLETE LAYER 3 INFO 38) COMPLETE LAYER 3 INFO 41) AUTHENTICATION REQUEST 42) AUTHENTICATION RESPONSE