-- Executing Hangup("Zap/19-1", "") in new stack
  == Spawn extension (fromoffice, h, 1) exited non-zero on 'Zap/19-1'
    -- Hungup 'Zap/19-1'
May 14 00:28:24 WARNING[10166]: chan_zap.c:1472 zt_set_hook: zt hook failed: Device or resource busy
    -- Starting simple switch on 'Zap/19-1'
    -- Hungup 'Zap/19-1'