FR && non encrypted calls

[Matthias Apitz]

El día Monday, July 04, 2011 a las 09:35:24AM +0300, Timo Juhani Lindfors escribió:

> Matthias Apitz <guru at unixarea.de> writes:
> > Is the FR capable to show that the call runs in non encrypted mode
> > because the BS forced the ME to this mode? The question is for Om2008.9
> > but as well valid for any other distribution running on the FR.
> 
> I think the GSM part (Calypso) delivers this information in the AT%CPRI
> message. With ogsmd (part of the python version of fso-frameworkd) I
> have lines like
> 
> Jul  3 11:57:43 ginger org.freesmartphone.GSM.Network.CypherStatus: enabled: unknown
> 
> in /var/log/syslog.
> 
> om2008.9 does not use ogsmd afaik but gsmd.

I did some tests sending down AT-cmds with the 'chat' command
and watching the AT chatting in /var/log/messages:

Per default it is set to off:

root at om-gta02:~# chat -vs < /dev/ttySAC0 > /dev/ttySAC0 '' 'AT%CPRI?'

Jul  5 07:39:50 om-gta02 local2.info chat[1556]: send (AT%CPRI?^M)
Jul  5 07:39:50 om-gta02 user.notice root: AtChat :  ? : "%CPRI: 0" 
Jul  5 07:39:50 om-gta02 user.notice root: AtChat :  ? : "OK" 

Then I switched it on with:

root at om-gta02:~# chat -vs < /dev/ttySAC0 > /dev/ttySAC0 '' 'AT%CPRI=1'

which gives in the /var/log/messages:

Jul  5 07:41:37 om-gta02 local2.info chat[1557]: send (AT%CPRI=1^M)
Jul  5 07:41:37 om-gta02 user.notice root: AtChat :  ? : "OK" 

then I dialed a number:

Jul  5 07:43:49 om-gta02 user.notice root: AtChat :  T : "ATD089xxxxxxxx;" 
Jul  5 07:43:51 om-gta02 user.notice root: AtChat :  N : "+CSSI: 1" 
Jul  5 07:44:17 om-gta02 user.notice root: AtChat :  F : "OK" 
Jul  5 07:44:17 om-gta02 user.notice root: Modem : QModemCall::dialRequestDone() 
Jul  5 07:44:17 om-gta02 user.notice root: AtChat :  T : "AT+CLCC" 
Jul  5 07:44:17 om-gta02 user.notice root: AtChat :  F : "%CPRI: 1,2" 
Jul  5 07:44:17 om-gta02 user.notice root: AtChat :  F : "OK" 
Jul  5 07:44:17 om-gta02 user.notice root: Modem :  dialing was ok, we are connected 
Jul  5 07:44:23 om-gta02 user.notice root: Modem :  QModemCall::hangup() 
Jul  5 07:44:23 om-gta02 user.notice root: AtChat :  T : "AT+CHLD=1" 
Jul  5 07:44:23 om-gta02 user.notice root: Modem :  hangup groups 
Jul  5 07:44:23 om-gta02 user.notice root: AtChat :  F : "OK" 

as you see, one of the result code of the TE is "%CPRI: 1,2", where the
'1' is for GSM (ciphering enabled) and the '2' for GPRS (ciphering state
not applicable), see also page 167 for the values in
http://www.cartft.com/support_db/support_files/CTFPND-3_AT_Command_Reference.pdf

with a bit of tweaking, at least this information is visible in the log
files if the connection is ciphered or not.

HIH

	matthias
-- 
Matthias Apitz
t +49-89-61308 351 - f +49-89-61308 399 - m +49-170-4527211
e <guru at unixarea.de> - w http://www.unixarea.de/