ED_ERR_MODEM_RUNNING after sending sms


I use dtl_dataSend(…) to send sms, it works fine but after the successful transfer, I can’t send any data (ftp,sms or mail) with dtl_dataSend(…) because the handler of dtl_srvSubscribe(handler, option) returns ED_ERR_MODEM_RUNNING. I find a workaround using adl_smsSend() but I’d prefer use dtl_dataSend. Do you have an idea ?