[Freeswitch-users] gsmopen error message

Hi, I am excited by new mod_gsmopen with dongle and trying it with my E1550. The function is OK. But I got some error message when sending SMS Quote freeswitch@ubuntu> chat SMS|gsm01|07575565692|test 2012-05-04 23:40:11.102053 [ERR] gsmopen_protocol.cpp:574 rev 2431e0f|de019ab[(nil)|37 ][ERRORA 574 ][gsm01 ][-1, 0, 0] TIMEOUT=1100 2012-05-04 23:40:11.182283 [ERR] gsmopen_protocol.cpp:574 rev 2431e0f|de019ab[(nil)|37 ][ERRORA 574 ][gsm01 ][-1, 0, 0] TIMEOUT=5500 Sent Unquote It is under the default configuration. Does anyone know the meaning and how to avoid it? Thanks Regards Eric