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tell me the scenario, i will tell u the call flow

HI kumaranurag ,

I want to ask u a question about call flow...the scenario is that ...During a MTC for a inroamer, lets say an outroamer from Indian operator is roaming at Austria. Then during interrogation procedure, the MS from India calls its ouroaming subscriber in Austria. In that case, the MS in India will use the MSISDN to locate GMSC.So after identification of GMSC it sends IAM to that GMSC. Then GMSC sends SRI msg to HLR.

I want to know that does that GMSC and HLR is from India or Austra?

Can u explain me about call flow for MTC in an ouroamer in VPLMN?

MTC of out roamer:

STEP 1:

A Party ---call--> A Party MSC/VLR ----call---> B Party GMSC ___}----> Call Flow

STEP 2:
B Party GMSC ----sig---> SendRoutingInfo ---sig--> HLR of B ___}----> Signalling

HLR of B ----sig---> SRI Resp ( VLR ) to B Party GMSC ___}----> Signalling

STEP 3:
B Party GMSC --call--> VLR of B ___}----> Call Flow

Hope its clear!

Thank you for the reply.

Can you help me by explaining the call flow for SMS on out roamer.

>> Can you help me by explaining the call flow for SMS on out roamer.

It is similar to MTC

STEP 1:

A Party ---mo-sms--> A Party SMSC

STEP 2:
A Party SMSC ----sig query---> SendRoutingInfoForSM ---sig--> HLR of B

HLR of B ----sig query---> SRI Resp ( IMSI+Serv MSC/VLR ) to A Party SMSC

STEP 3:
A Party SMSC --sms-mt--> VLR of B -->mt-sms--> B party

In case of inraomer to inroamer in a VPLMN, after location update , the serving MSC/VLR has the information of the inraomers right ? as the serving MSC/VLR queries the Home HLR right? But when MOC from inroamer to inroamer does it again queries the HLR, i am confused about the call flow. Can u help me?

In my understanding:

step1:
Inraomer A ---call--> serving MSC/VLR ----call---> visiting GMSC ___}----> Call Flow

STEP 2:
Home GMSC ----sig---> SendRoutingInfo ---sig--> home HLR ___}----> Signalling

Home HLR ----sig---> SRI Resp ( VLR ) to home GMSC ___}----> Signalling

STEP 3:
Home GMSC --call--> Visiting GMSC ___}----> Call Flow

STEP 4:
Visiting GMSC--call-->serving visiting MSC/VLR___}----> Call Flow

Is my understanding Okay???
Admin please correct it.

please refer to http://www.eventhelix.com for call flow.

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