interfacing core network to SIP world

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Neels Hofmeyr nhofmeyr at sysmocom.de
Mon Aug 5 19:40:28 UTC 2019


On Mon, Aug 05, 2019 at 06:30:14PM +0200, Neels Hofmeyr wrote:
> > IIUC,  in the traditional core network. When an MSC receives a MO SETUP
> > from a local MS, and it does not have this number in the VLR, it should
> > be querying HLR for routing info, (which may subsequently query another
> > HLR) no? why are we only doing VLR lookup in the MSC? Is it simply "To
> > be implemented" ?
> 
> Yes, these are leftovers of the OsmoNITB paradigm, being "I am the entire core
> network". If a subscriber isn't attached, it doesn't exist.

Let me rephrase: back then the subscriber database was in the OsmoNITB and
non-attached subscribers did exist. The inability to recognise unattached
subscribers as existing crept in during the separation of the HLR.

~N
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