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Troubleshoot roaming fault

wallis dudhnath - 28th May 2019  (07:56 GMT)

Hi Gerinc,

Sorry for the delayed answer. Just a follow up to Rawand's response.

For Roaming to work there needs to be a Roaming Agreement between the HPLMN and the VPLMN.

This will help to ensure that the Service Level Agreement can be fulfilled and will ensure that
Billing information can be extracted / processed and sent to the relevant Mobile / Wireline operator (CSP). Refer to TAP3 / RAP processes.

With GSM (and 3G, 4G, etc..) the HLR / HSS / UDC / etc.. is updated when there is a change of Location.
This is required so that the HPLMN can signal and route calls. At the time of writing (2019) most CSPs are using CAMEL, e.g. Phase 2, as a Feature to help with Telephony PrePaid services. The VPLMN and the HPLMN will
as a minimum be required to support CAP V2 and MAP V3. The MSC/VLR/gsmSSF and the STP layer will need to be
able to process IMSI and MSISDN.

IMSI analysis and MSISDN digit decoding are Features that MSC/VLR/gsmSSF supports.

VBR/ Wallis Dudhnath

CAP - CAMEL application part

CSP - Communication Service Provider

MAP - Mobile Application Part

rawand - 20th May 2012  (09:06 GMT)

dear is didn't get your poing but for making a success location update like if you roamer A and what to perform a success LU under B in B side you IMSI translation with E164 & E214 need to be added in MSCs STPs and SCCP carrier in A side will added B E164 in their HLR for camel their E164 and VMSC GTs need to be added too in IN side

Gerinc - 22nd March 2012  (16:37 GMT)

Hello to all in forum,

May somebody say me what could be the basic verifications needed to do in Operator A when a subscriber of Operator A is in roaming in Operator B (in other country) if Subcriber A is not making Location Update.

For roamers of Operator B to roam in Operator A (I would be A operator) I need to verify the IMSIS analysis and Global title data, but the opposite event how would be?

I think to verify with signaling provider, but in MSC of my side is needed to verify something?

Thanks for any help.


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