ana coba bikin smsgateway di ubuntu 14.04 pake gammu

hasilnya kurang lebih begini :

root@kasdi:/# gammu identify
Device : /dev/ttyUSB0
Manufacturer : Wavecom
Model : MULTIBAND 900E 1800 (MULTIBAND 900E 1800)
Firmware : 651b09gg.Q2406B 244 041410 13:45
IMEI : 350965720242070
SIM IMSI : 510111291962915
root@kasdi:/#


*modem udah ke detect

cma pas mau kirim sms haslinya kaya gini :

root@kasdi:/# echo "test" | gammu sendsms TEXT 087825954144
If you want break, press Ctrl+C...
Sending SMS 1/1....waiting for network answer..error 512, message reference=-1
Unknown error.




ada solusi gan????