The Home SMS-SC can query the HLR (or now UDC/HSS) to determine if the End User is in the HPLMN or if they are Roaming. MAP V3 (or higher) can be used with the HLR/UDC/HSS. The MAP query will be AnyTimeInterrogation(). This will provide the status of the End User and the Location.
HLR supports a lot of barring flags that can be configured using MML.
VBR/ Wallis Dudhnath
Emef - 8th August 2011 (19:12 GMT)
To avoid SMS MO sending for own subscribers in roaming on other VLR which doesn't support Camel 3, what configuration should be done in HLR (Ericsson) ???