[root@voismart exten]# cat /proc/zaptel/1
Span 1: WCT1/0 "Digium Wildcard E100P E1/PRA Card 0" HDB3/CCS/CRC4 ClockSource

           1 WCT1/0/1 Clear (In use)
           2 WCT1/0/2 Clear (In use)
           3 WCT1/0/3 Clear (In use)
           4 WCT1/0/4 Clear (In use)
           5 WCT1/0/5 Clear (In use)
           6 WCT1/0/6 Clear (In use)
           7 WCT1/0/7 Clear (In use)
           8 WCT1/0/8 Clear (In use)
           9 WCT1/0/9 Clear (In use)
          10 WCT1/0/10 Clear (In use)
          11 WCT1/0/11 Clear (In use)
          12 WCT1/0/12 Clear (In use)
          13 WCT1/0/13 Clear (In use)
          14 WCT1/0/14 Clear (In use)
          15 WCT1/0/15 Clear (In use)
          16 WCT1/0/16 HDLCFCS (In use)
          17 WCT1/0/17 Clear (In use)
          18 WCT1/0/18 Clear (In use)
          19 WCT1/0/19 Clear (In use)
          20 WCT1/0/20 Clear (In use)
          21 WCT1/0/21 Clear (In use)
          22 WCT1/0/22 Clear (In use)
          23 WCT1/0/23 Clear (In use)
          24 WCT1/0/24 Clear (In use)
          25 WCT1/0/25 Clear (In use)
          26 WCT1/0/26 Clear (In use)
          27 WCT1/0/27 Clear (In use)
          28 WCT1/0/28 Clear (In use)
          29 WCT1/0/29 Clear (In use)
          30 WCT1/0/30 Clear (In use)
          31 WCT1/0/31 Clear (In use)
-------------------------------------------------
-- Executing Dial("SIP/228-3c8b", "Zap/g3/32xxxxxx") in new stack
    -- Called g3/32xxxxxx
Dec 22 15:08:08 NOTICE[5100]: chan_zap.c:8725 pri_dchannel: SETUP_ACK for 'Zap/1-1'
    -- Channel 0/1, span 1 got hangup
    -- Zap/1-1 is circuit-busy
    -- Hungup 'Zap/1-1'
  == Everyone is busy/congested at this time
    -- Executing Busy("SIP/228-3c8b", "10") in new stack
  == Spawn extension (dial_freefile, 032xxxxx, 102) exited non-zero on 'SIP/228-3c8b'