Dear Joffrey,
In case you want to switch protocol to Codec 8, you are able to do so by sending SMS/GPRS message (without quotation marks):
' setparam 113:0;'
If you do not have SMS login and password set, place two space symbols before entering the command.
If you have configured SMS login and password, the composition is – login password setparam 113:0;
Kind regards,
Simonas