Sierra Wireless: SMS with AT, special characters

Hi!

We are using Sierra Wireless cards in our systems for SMS sending.
We access them as serial modems with the AT/Hayes commands.

If we try to send a testmessage with a character of the MSM extended-charset (e.g. {, [, }, }, |, …) we get an error.
Messages without any of these characters are fine.

at
OK
AT+CMGF=1
OK
AT+CMGS=“12345678”

test ok

+CMGS: 164
OK

AT+CMGS=“12345678”

test [nok]

+CMS ERROR: 305

Is there a way to send that characters? Maybe we need a special encoding or something??
Thanks for help!

Chris

I think you should be able to do this in PDU mode.
AT+CMGF=0

If you are not familiar with PDU encoding there are several PDU generators available on the web.