Dont get message untill at+stgi=9

Dear All,

I have q24pl004 wavecom modem. while working with at commands I observed that some modem gives +CMTI "SM’’ without AT+STGI=9 and some modem compulsory requires AT+STGI=9 for +CMTI “SM”

so please tell me how to avoid use of AT+STGI=9

It will be great help if some one answers me…

Thank you … +CSMP+CSCA