Workaround implemented by Ivan working fine for me now. sendsms is much more reliable. Thanks Ivan<br><br>&gt;&gt;&gt;<br><br>We were recently looking into a bug when MT-SMS delivery was 
interrupted with an unexpected UA frame on L2 layer. We&#39;ve fixed this in our branch by ignoring a second UA in Established L2 state [1], but 
the real issue lies in the filler table coupled with delays in  processing in higher layers.<br><br>