Any way to get more feedback when sending sms?

trixbox 2.8.0.4, installed chan-extra as in manual at http://www.chan-extra.org/index.php/OpenVox_G400P_User_Manual_for_dahdi Card works, it means if I type in asterisk console "gsm send sms 1 XXXX test" - I get this sms on my phone. The problem is - I didn't find any debugging possibility to check when SMS actually is sent. I need it to be able to queue messages correctly. At the moment if I order one more SMS to be sent directly after first one (in other words - if I order two sms to be send one after another, from one span) - span freezes.
If I enable span debugging, and try to operate on all spans at once their feedback gets messed up and I have still no way to check when the SMS gets send actually.

To say short - if I enter two times "gsm send sms 1 XXXX test" in asterisk CLI - that span hangs, and the only way to enable it again is to remove the module from kernel and load it again.

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