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CAMEL Phase-1,2,3,4 - ?????

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Wallis Dudhnath - 29th October 2016  (13:15 GMT)

CAMEL Standards (Phase 1-4) were standardised well before Diameter (DCCA), Gy, Gx, Sy, Policy (PCRF), etc..

For online charging the basic functionality as now defined by IETF Diameter Credit Control Application (DCCA) is used. The basic structure follows a mechanism where the online client (CTF) requests resource allocation and reports credit control information to 3GPP OCS (Online Charging System).

CAP V3 can be used for MO-SMS Charging (CAP V4 supports MT-SMS).

VBR/ Wallis Dudhnath

Antoine Egho - 29th October 2016  (04:00 GMT)

what is the use of CAPv3 for Data Charging when VPLMN SGSN will always contact HPLMN GGSN, which nowadays are connected to OCS thru Gy?

Wallis Dudhnath - 14th July 2016  (10:27 GMT)

Thanks Prashant,
Please let me know if you need any further inputs for IN / CAMEL.

VBR/ Wallis Dudhnath

Prashant M Hullatti - 13th July 2016  (13:21 GMT)


Wallis Dudhnath - 5th July 2015  (12:01 GMT)

CAMEL - Customised Application Enhanced Logic - has
an association with IN - Intelligent Networks.

As IN Services expanded with GSM there was an issue with Roaming.
The use-cases were not standardised and this meant IN Services in the
HPLMN could not be used in the VPLMN. The answer was to use the existing IN
protocols: CS-1 (or variants) and to update it so that HPLMN can be used in the
VLPMN. This led to CAMEL which is basically a Network feature based on CAP V2 (or later versions)
and MAP V3 (or 4, etc..). CAMEL also helps with interoperability. CSPs can interwork gsmSSF, gsmSCF,
gprsSSF, gsmSRF, IP, etc.. from different vendors. Traditional "lock-in" from IN systems is now

At the time of writing CAP V2 is well proven for Roaming PrePaid Voice (telephony) calls.
Data Traffic is now charged using Diameter (DCCA).

CAMEL as a standard that is no longer evolving. The last set of standards was done with
CAMEL Phase4 via 3GPP.


CAP V1: Proof of concept. Several messages were supported
CAP V2: Similar message set that INAP / CS-2 supports. Geared up for Mobility and allows calls to be "teared down" based
on rules set with the PrePaid application
CAP V3: MO-SMS and Volume Based GPRS Charging
CAP V4: Call Party Handling (add / remove callers move_Legs)
Network-initiated call establishment (InitiateCallAttempt), Interaction with basic optimal routing, Alerting detection point
Mid-call detection point, Change of position detection point, Flexible warning tone and Tone injection and
Enhancement to call forwarding notification

With the rapid growth of the Internet, Web2.0/3.0, SIP, Diameter, etc.. it has reduced the role of CAMEL Phase 4 as a
Multimedia Standard for VHE / OSA (Virtual Home Environment).

Abhishek Chauhan - 28th November 2007  (07:22 GMT)

The CAMEL Phase 3 & 4 have certain features, which were not available in CAP 1 & 2. The CAP 3 includes all featues of CAP1 and CAP2 plus additional features for Data charging. Other than this, there are certain other messages also, which were added in CAP 3, which could be useful from the services point of view.
CAP 4 includes some additional features like MT SMS triggereing. The main feature of CAP 4 is ICA (Initiate CAll Attempt), which was not there in old releases.
Through this feature, the SCF can initiate the dialougue on it's own, without any triggering from the SSF.

atif - 30th October 2007  (16:38 GMT)

hi can you tell me the purpose of camel 3 and 4

Mucky - 24th October 2007  (04:04 GMT)

Dear Ashok,

Camel Phase 2 Feature,
o Online Charging Control
o Notifications
o Call Control
o Conditional Triggering

That's I know...maybe somebody else could help?

Ashok - 17th October 2007  (07:16 GMT)

Can somebody just give a summary of the features supported by CAMEL Ph-1, 2 ,3 & 4 . Like CAMEL-2 would of course cover features fo CAMEL -1 + additional features. I Need to know the original features as in CAMEL -1 & then the additional features as offered in CAMEL-2, 3 & 4 .

It would be a great help

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