Jun 28 14:21:13 WARNING[4753]: chan_zap.c:7542 zt_pri_error: [Span 0 D-Channel 0] PRI: Write to 27 failed: Unknown error 500
Jun 28 14:21:13 WARNING[4753]: chan_zap.c:7542 zt_pri_error: [Span 0 D-Channel 0] PRI: Short write: 0/15 (Unknown error 500)
Jun 28 14:21:13 WARNING[4753]: chan_zap.c:3401 zt_handle_event: Detected alarm on channel 2: Yellow Alarm