can u explain call flow for roaming mobile to roaming
mobile?(both users are belongs to same state but staying on
roaming in different states)
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Answer Posted / manjunath gk
Ex: Assume, A & B subscribers are from Karnataka and A is roaming in Rajasthan and B is roaming in Kerala
When A calls B
1. SRI message with the B MSISDN is sent to Rajasthan GMSC
2. Rajasthan GMSC will verify and finds that this call can be handled by the Karnataka GMSC and forwards the request to Karnataka GMSC
3. Karnataka GMSC sends forwards the SRI to HLR.
4. HLR prepares a search request using the B party MSISDN and fetches the B subscribers details from its database and finds the VLR/MSC number where B is registered (in this ex: Kerala VLR/MSC)
5. HLR sends PRN to the local GMSC, which is then frowarded to Kerala GMSC.
6. On receiving back the MSRN, HLR sends to the A party GMSC (Rajasthan GMSC)
7. Rajasthan GMSC using this MSRN prepares a IAM message and the ISUP trunk is ceased
| Is This Answer Correct ? | 47 Yes | 13 No |
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