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Wallis Dudhnath - 27th January 2017  (12:17 GMT)

Location update to the VLR (VPLMN MSC/VLR) is done via MAP, e.g. MAP V3.
CAMEL is a Network Protocol that uses CAP (e.g. CAP V2/V3) and MAP (e.g. MAP V2 / V3).

Protocols have been designed to allow a degree of "auto-bauding". MOC calls can be made.

eleni - 25th January 2017  (13:47 GMT)

VPLMN roaming network support CAMEL PHASE 3 and
our subscriber which perform LOCATION UPDATE in VPLMN support PHASE 2


Wallis Dudhnath - 13th January 2017  (11:46 GMT)

Hi Eleni,

You will need to confirm that the Roamers have CAMEL flags set in the HPLMN. You will need to check this with the HPLMN CSP. Next step is to use a protocol analyser with a trace to look at the CAP V2 and MAP messages that are exchanged between the VPLMN (your Network) and the HPLMN. There maybe a node in the signalling chain that is "filtering" the IDP. Check what SS7 Policing Masks you have on your egress routes.

VBR/ Wallis Dudhnath

eleni - 12th January 2017  (07:48 GMT)

Thanks for your reply .
The problem is that we have roamers -prepaid to our network.

they support that we don't send IDP message from our VLR/MSC...

But we have only problem with two RPs

could ypu please send me your help ..

Wallis Dudhnath - 27th September 2016  (10:21 GMT)

Hi Eleni,

The VLR is associated with the MSC.
VLR hosts information from the HLR.

The Service Key and other CAMEL parameters are sent via the gsmSSF to the SCP (gsmSCF). IDP method() is used.

VBR/ Wallis Dudhnath

eleni - 26th September 2016  (08:33 GMT)


Wallis Dudhnath - 6th July 2015  (14:55 GMT)

Just to answer some of your questions.

For CAMEL the DP (e.g. DP2) is done via the gsmSSF.
The configuration of the DP or other Trigger Detection Points is
done via MML - Man Machine Language commands.

CAMEL Subscription Identity Flags (O-/T-CSI) are configured
in the HLR. x-CSI flags enables the MSC/VLR/gsmSSF to trigger the
SCP (gsmSCF).

Ajay - 17th July 2009  (09:57 GMT)


What i hv learnt about the IN call flow is tht they define a tariff for various PID's and they store it in the SCP.
When IN subscribers take any service of IN they put tht subscriber into tht service PID(Provider ID) O-CSI and T-CSI contains contains the service key for a particular service and whn a subscriber calls their call flows acc to the services they hv asked for. like one may hv got his local call free so the amount will be deducted from his offpeak balance ..and all this information is stored in SCP...

Foo - 12th February 2007  (02:44 GMT)

Hi, i've read this thread with much interest as i'm quite new to this Camel & CAP2 stuff.

In a prepaid scenario, how does the MSC "query" the IN for credit balance by using CAP2? What is the CAP2 specific message that will be used?

When a prepaid sub makes a MO-Call, does the MSC goes to the HLR first to get the O-CSI? Then with that, it triggers a InitDP to the IN? After which, then it successfully makes a call out? Is double-triggering allowed - meaning to send a 2nd InitDP out to another node?

Is this how the callflow will be like? If anyone has the callflow, can you kindly share it? Thanks!

muhammad arshad - 11th February 2007  (05:42 GMT)

Mr. Hari,

If you are not wrong, how can we correct you.


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