1. Does subscriber have permission in his HLR profile on GPRS network access mode?
2. Does subscriber have permission in his HLR profile on roaming in that SGSN (if he is roamer) ?
3. Does HLR accessible by SCCP (E.214 & E.164 addresses) from that SGSN ?
4. Does SGSN accessible by SCCP (E.164 addresses) from subscriber’s HLR ?