tree dbc8080f439a729934a20d42964d0f896b9c60d0
parent 58cf664d289a4cb0511d51a66f92e8eb4e7fa597
author Holger Hans Peter Freyther <holger@moiji-mobile.com> 1407244823 +0200
committer Holger Hans Peter Freyther <holger@moiji-mobile.com> 1407244823 +0200

sgsn: Make P-TMSI a local TLLI to avoid clash

Some broken equipment does not convert the P-TMSI to a Local TLLI.
This leads to the SGSN ignoring the GPRS Attach Complete message
from the phone. Proprietary SGSNs and some documentation we found
state that one should always set the two highest bits of a P-TMSI
to one. This will help broken equipment and will avoid a potential
P-TMSI/TLLI clash. The P-TMSI/Local TLLI mapping is now bijective.