sms argc 2 queue <0> opts <s> addr <> body <>
 initial delay 300ms
       > 0x7f74cc03f1e0 -- Strict RTP switching to RTP target address 192.168.106.133:5122 as source
    -- SMS RX 93 00 6D
[Jul 31 03:36:04] NOTICE[7919]: app_sms.c:832 sms_readfile: Sending /var/spool/asterisk/sms/mttx/0.1753925754-7918
    -- SMS TX 94 00
[Jul 31 03:36:05] NOTICE[7919]: app_sms.c:2056 sms_exec: ast_read failed