UMG181 sms slots start with 0 instead of 1?

Hi,

I'm using a Huawei UMG181 attached to a RHEL system (kernel
2.6.18-194.el5).  Kannel version is 1.4.3 built from source.  I have
sim-buffering = true in my config.

Running bearerbox -v 0 gave me this error over and over again.

...
2010-04-22 09:13:32 [12167] [7] DEBUG: AT2[huawei]: --> AT+CMGR=30^M
2010-04-22 09:13:32 [12167] [7] DEBUG: AT2[huawei]: <-- +CMS ERROR: 321
2010-04-22 09:13:32 [12167] [7] ERROR: AT2[huawei]: CMS ERROR: +CMS ERROR: 321
2010-04-22 09:13:32 [12167] [7] ERROR: AT2[huawei]: CMS ERROR: Invalid
memory index -> don't worry, just memory fragmentation. (321)
...

starting with CMGR=1 and repeating to CMR=30.  The response from
+CPMS=? earlier in the log was:

2010-04-22 09:13:29 [12167] [7] DEBUG: AT2[huawei]: --> AT+CPMS?
2010-04-22 09:13:29 [12167] [7] DEBUG: AT2[huawei]: <-- +CPMS:
"SM",4,30,"SM",4,30,"SM",4,30

From a gtkterm session with the modem, i can issue AT+CMGR=0 and get a
message.  So it seems that this modem starts numbering slots at 0
instead of 1.

In gw/smsc/smcs_at.c line 1074 (1.4.3 codebase), i changed the for
loop to be from 0 to capacity-1 instead of 1 to capacity in the
function at_read_sms_memory.  Clearly there's a better solution, but
this fixed my problem for now.

This device is somewhat new, but is it the first to use 0 based slots?

As a footnote, I was using sim-buffering = true to be able to receive
messages that the modem buffered while kannel wasn't running.  Is
there a better way to do that?  My modem init string is:
init-string = "AT^PORTSEL=1;+CNMI=2,1,2,2,0"
The "^PORTSEL=1" was the double secret magic command to get CMTI
notifications to work on /dev/ttyUSB0, btw.  I found this purely by
experimentation trying commands that the modem reported from a command
list.  I was unable to find any documentation on it though.

Thanks,
Chris