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GSM Terminology
VLR Visitor Location Register
HLR Home Location Register
AUC Authentication center
EIR Equipment Identification
MSC Mobile Switching center
BTS Base Transceiver Station
BSC Base Station Controller
SCP Service control point
SDP Service Data Point
SSF Service Switching Functionality
SMSC Short Message Switching Center
MMSC Multimedia Messaging Service
USSD Unstructured Supplementary Service Data
GPRS General Packet Radio Service
EDGE Enhanced Data Rates for GSM Evolution
SGSN Serving GPRS Support Node
GGSN Gateway GPRS Support Node
HSCSD High-Speed Circuit-Switched Data
IVR Interactive voice response
 
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Fri, 03/26/2010 - 14:28
9797
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User offline. Last seen 5 weeks 1 day ago. Offline
VISHNU'S BLOG
Joined: 05/12/2009
Posts:
Points: 936
CAMEL phase 1:
1.1 CAMEL phase 1 functionality:
Functionality
Purpose / supports
Restrictions
Triggering on MO, MT and forwarded calls.
  • Call screening
  • Simple VPN
  • Call Forwarding
  • Call Redirection
  • Call Rerouting
  • Homing of pre-paid calls to HPLMN
  • No IN announcements supported
  • No charging operations
  • Limited set of detection points, e.g. the hunting services are not possible.
  • MT calls trigger in the GMSC only.
  • Not possible to activate Call Forwardings with VPN short codes.
Any Time Interrogation
  • The CSE may request HLR to provide subscriber status and/or location information at any time.
  • The exact location may not be up-to-date unless the mobile has an active call ongoing.
  • CS only
CAMEL phase 2:
2.1 CAMEL phase 2 functionality:
Functionality
Purpose / supports
Restrictions
Triggering on MO, MT and forwarded calls.
  • Call screening
  • VPN for calls
  • Call Forwarding
  • Call Redirection
  • Call Rerouting
  • Follow-on calls
  • In-band user interaction (DTMF)
  • Tones and announcements
  • MT calls trigger in the GMSC only.
Charging operations
  • Pre-paid (MO, MT, CF)
  • Free-phone
  • Premium rate
  • Personal Discount
  • Location Dependent discount
  • Reverse Charging
-
CSE provided e-parameters
  • MO AoC
-
New detection points (Abandon, Busy, NotReachable, NoAnswer, RouteSelectFailure cases)
  • Cleaner termination of relationship.
  • Better pre-paid service.
  • Hunting type of services.
-
Triggering criteria
  • To reduce CSE & SSP load
-
Any Time Interrogation
  • The CSE may request HLR to provide subscriber status and/or location information at any time.
  • The exact location may not be up-to-date unless the mobile has an active call ongoing.
  • No call supervision
USSD communication between MS and CSE
  • USSD call-back for pre-paid roaming
  • Control & enquiry of IN services
 
Control of north American carrier information
  • Enhances pre-paid
  • CSE based carrier selection
  • Selecting correct long distance network for user interaction
 
Notification of supplementary service (CCBS, ECT, CD and MPTY) invocation to CSE
 
  • Fraud control
 
3 CAMEL phase 3:
3.1 CAMEL phase 3 functionality:
Functionality
Purpose / supports
Restrictions
Triggering on MO, MT and forwarded calls.
  • Call screening
  • Full VPN
  • Call Forwarding
  • Call Redirection
  • Call Rerouting
  • Follow-on calls
  • In-band user interaction (DTMF)
  • Tones and announcements
 
Charging operations
  • Pre-paid (MO, MT, CF)
  • Free-phone
  • Premium rate
  • Personal Discount
  • Location Dependent discount
  • Reverse Charging
 
CSE provided e-parameters
 
 
CAMEL2 new detection points (Abandon, Busy, NotReachable, NoAnswer, RouteSelectFailure cases)
  • Cleaner termination of relationship.
  • Better pre-paid service.
  • Hunting type of services.
 
CAMEL3 new trigger detection points.
  • To trigger on demand only, e.g. for hunting services.
 
Triggering criteria
  • To reduce CSE & SSP load
 
Any Time Interrogation. Enhanced with CAMEL3 current location retrieval, and ATI for GMLC.
  • The CSE may request HLR to provide subscriber status and/or location information at any time.
 
  • CS only
USSD communication between MS and CSE
  • USSD call-back for pre-paid roaming
  • Control & enquiry of IN services
 
Control of north American carrier information
  • Enhances pre-paid
  • CSE based carrier selection
  • Selecting correct long distance network for user interaction
 
Notification of supplementary service (CCBS, ECT, CD and MPTY) invocation to CSE
 
  • Fraud control
 
Call Gapping
  • To control CSE overload situations within HPLMN
  • For CS calls only. Not for SMS or GPRS.
MT call triggering in VMSC-B
  • To control MT supplementary services (CW, hold, CF, CD, ECT, MPTY)
  • Pre-paid for MT air-time charge (1st minute free, e.g. in USA)
 
Abandon as an EDP-R
  • Improves charging
 
Enhanced FreeFormatCharging data (40 octets -> 160 octets)
  • Makes the CSE service logic easier
 
Reporting of MSRN/FTN to CSE
  • Charging control of optimally routed calls
 
CSE-HLR interface: ATM/ATSI/NSDC
  • Multiple Subscriber Profile phase 2
  • CSE can control CF, barring supplementary services.
  • Off-line subscription control based on VPLMN / time-of-day
  • Virtual operators
 
Subscribed dialled services (D-CSI)
  • HPLMN specific service numbers
  • No call supervision
Serving Network Dialled services (N-CSI)
  • VPLMN specific service numbers
  • No call supervision
MO SMS control (CS+PS)
  • Enhances pre-paid.
  • Enhances VPN
  • No MT SMS control.
  • Not content based
Inter-working with GPRS
  • GPRS pre-paid
  • Not content based
CS Mobility management notifications
  • CSE can monitor location / reachability
 
Service Interaction Indicators
  • CSE can control inter-working with supplementary services (CW, hold, CF, CD, ECT, MPTY).
  • Multiple subscriber profile phase 2
 
 

CAMEL phase 4:

4.1 CAMEL phase 4 functionality in Release 5:
Functionality
Purpose / supports
Restrictions
Triggering on MO, MT and forwarded calls.
  • Call screening
  • Full VPN
  • Call Forwarding
  • Call Redirection
  • Call Rerouting
  • Follow-on calls
  • In-band user interaction (DTMF)
  • Tones and announcements
 
Charging operations
  • Pre-paid (MO, MT, CF)
  • Free-phone
  • Premium rate
  • Personal Discount
  • Location Dependent discount
  • Reverse Charging
 
CSE provided e-parameters
  • MO & MT AoC
 
CAMEL2 new detection points (Abandon, Busy, NotReachable, NoAnswer, RouteSelectFailure cases)
  • · Cleaner termination of relationship.
  • · Better pre-paid service.
  • · Hunting type of services.
 
CAMEL3 new trigger detection points.
  • · To trigger on demand only, e.g. for hunting services.
 
Triggering criteria
  • · To reduce CSE & SSP load
 
Any Time Interrogation. Enhanced with CAMEL3 current location retrieval, and ATI for GMLC. CAMEL4 enhances this to PS domain.
  • The CSE may request HLR to provide subscriber status and/or location information at any time.
  •  ATI for GMLC
 
USSD communication between MS and CSE
  • USSD call-back for pre-paid roaming 
  • Control & enquiry of IN services
 
Control of north American carrier information
  • Enhances pre-paid· 
  • CSE based carrier selection
  • Selecting correct long distance network for user interaction
 
Notification of supplementary service (CCBS, ECT, CD and MPTY) invocation to CSE
 
  • · Fraud control
 
Call Gapping
  • · To control CSE overload situations within HPLMN
For CS calls only. Not for SMS or GPRS.
MT call triggering in VMSC-B
  • · To control MT supplementary services (CW, hold, CF, CD, ECT, MPTY)
  • · Pre-paid for MT air-time charge (1st minute free, e.g. in USA)
 
Abandon as an EDP-R
  • · Improves charging
 
Enhanced FreeFormatCharging data (40 octets -> 160 octets)
  • · Makes the CSE service logic easier
 
Reporting of MSRN/FTN to CSE
  • · Charging control of optimally routed calls
 
CSE-HLR interface: ATM/ATSI/NSDC
  • Multiple Subscriber Profile phase 2
  • CSE can control CF, barring supplementary services.
  • Off-line subscription control based on VPLMN / time-of-day
  • Virtual operators
 
Subscribed dialled services (D-CSI)
  • · HPLMN specific service numbers
· No call supervision
Serving Network Dialled services (N-CSI)
  • · VPLMN specific service numbers
· No call supervision
SMS control (CS+PS)
  • · Enhances pre-paid.
  • · Enhances VPN
· Not content based
Inter-working with GPRS
  • · GPRS pre-paid
· Not content based
CS Mobility management notifications
  • · CSE can monitor location / reachability
 
Service Interaction Indicators
  • · CSE can control inter-working with supplementary services (CW, hold, CF, CD, ECT, MPTY).
  • · Multiple subscriber profile phase 2
 
Interactions with Optimal Routing
  • · CSE can control usage of OR
 
Call Party Handling
  • Wake-up calls 
  • Conference calling
  • Parallel hunting
  • Click-to dial
  • IN based CCBS
 
Mid call procedure for MO and MT calls
  •  Control CPH configuration during call.
  • Automatic call collect
 
CAMEL for IMS
  • IMS pre-paid
  • Convergence to CS and GPRS services
 
Inclusion of flexible tone injection
  • Enhancements of pre-paid warning tones
  • Various informative tones
 
 
  •  
 
Provision of location information of called subscriber (Alerting phase)
  • The location of B-subscriber at the beginning of the call provided to service logic
 
Notification of GPRS mobility management to CSE
  • CSE can monitor location / reachability in PS side
 
Inclusion of ODB data in the CSE-HLR interface
  • Enhancement of MSP ph 2
 
Location information during an ongoing call (Handover DP)
  • Charging based on current location, for inter-PLMN and/or inter-system handovers
 
Transfer of the IMEI (with software version) and MS class mark to the CSE
  • allow the gsmSCF to determine information about the capabilities of the ME
 
Any Time Interrogation from CSE to MNP-SRF
  • Number portability query for prepay calls
 
Partial implementation of CAMEL phase 4
  • A functional entity (VMSC, GMSC or SGSN) may support the complete CAMEL phase4 functionality or, as a network option, it may support the complete CAMEL phase3 functionality and a partial implementation of CAMEL phase4.
 
 
4.2 CAMEL phase 4 additions in Release 6
Enhancements of Dialled Services
·Full control of Dialled Services
Full CAMEL4 prepay support for SCUDIF
·The capability to report basic service code changes during ongoing call.
Change of position procedure armed with criteria
· Technical enhancement to reduce the signalling load
 

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