-- Called Ctrix
 [AG]      Ctrix > OK
 [AG]      Ctrix > +CIEV: 3,2
 [AG]      Ctrix > +CIEV: 4,2
 [AG]      Ctrix > +CIEV: 1,1
 [AG]      Ctrix > +CIEV: 3,0
 [AG]      Ctrix > +CIEV: 4,0
Oct 12 01:00:11 WARNING[2785139632]: chan_bluetooth.c:342 sco_thread: SCO thread started on fd 40, pid 30311
    -- BLT/Ctrix answered SIP/523-73d9
 [AG]      Ctrix < ATH
 [AG]      Ctrix < AT+CHUP
  == Spawn extension (internal, 799, 1) exited non-zero on 'SIP/523-73d9'
 [AG]      Ctrix > OK
 [AG]      Ctrix > OK
 [AG]      Ctrix > +CIEV: 1,0