First, you need to check if your modem support voice calls. Connect in the TTY (In FreeBSD i use, cu -l /dev/ttyUx.0), and send this command AT^CVOICE=? Then, the return must be something like: ^CVOICE:(0) To enable voice, send AT^CVOICE=0 To disable voice, send AT^CVOICE=1 If this wont work, and the voice is disabled, try to use dc-unlocker https://freeswitch.org/confluence/display/FREESWITCH/mod_gsmopen#mod_gsmopen... Try to make a call, and send the log during the call. You need to remove and reload this modem before, because when it enter in this state, you was unable to do calls again. The list before this test, must be something like this, note State = IDLE and CallFlw = CALL_IDLE. freeswitch@internal> gsm list gsm console is NOT yet assigned F ID Name Operator IMEI IB (F/T) OB (F/T) State CallFlw UUID = == ========== ================ =============== ========= ========= ======= =============== ==== 1 gsm_1 72416 359390027149600 0/0 0/0 IDLE CALL_IDLE 2 gsm_2 72404 353871025084879 0/0 0/0 IDLE CALL_IDLE 3 gsm_3 72406 354112034907191 0/0 0/0 IDLE CALL_IDLE 4 gsm_4 72405 867919018470461 0/0 0/0 IDLE CALL_IDLE So, make a call test, and report the log, to see whats happening. -- Luiz Fernando Softov +55 67812 34276 http://www.softov.com.br fernando@softov.com.br