24 Jun
2009
24 Jun
'09
5:25 p.m.
Holger -
[OpenBTS - I'm cross posting this from OpenBSC.]
A problem we had with a lot of PDA phones in OpenBTS was that they
would attempt to register or access CM services by TMSI, even when
our system had a different MCC/MNC/LAC and even when we had not yet
assigned a TMSI. I first saw this with a Palm Treo 650 but have seen
it with other PDA phones since then. I suspect a lot of them are
using the same broken GSM chipset that does not follow the standard's
TMSI invalidation rules. I don't know what you do for TMSI
resolution in OpenBSC, but if you don't handle this case correctly
you will have problems with these handsets.
-- David
On Jun 24, 2009, at 7:33 AM, Holger Freyther wrote:
David A. Burgess
Kestrel Signal Processing, Inc.
But Holger, do you also have registering issues
with pda-phones, like
the HTC or maybe even the iPhone?
I remember we had some problems with the PDA phones at the 25C3, I
currently
have no physical access to any BTS and can't do tests.
z.