-- Executing Dial("SIP/4301-40e933a8", "Unicall/g1/0213181429093") in new stack
    -- Called g1/0213181429093
Jul 13 20:26:49 WARNING[1016]: chan_unicall.c:2644 handle_uc_event: Unicall/2 event Dialing
    -- UniCall/2-1 is circuit-busy
    -- Hungup 'UniCall/2-1'
  == Everyone is busy/congested at this time (1:0/1/0)
    -- Executing Goto("SIP/4301-40e933a8", "1-CONGESTION|1") in new stack
    -- Goto (4301,1-CONGESTION,1)
    -- Executing Dial("SIP/4301-40e933a8", "Unicall/g1/1-CONGESTION") in new stack
    -- Called g1/1-CONGESTION
Jul 13 20:26:49 WARNING[1016]: chan_unicall.c:2644 handle_uc_event: Unicall/3 event Dialing
    -- UniCall/3-1 is circuit-busy
    -- Hungup 'UniCall/3-1'
  == Everyone is busy/congested at this time (1:0/1/0)
    -- Executing Hangup("SIP/4301-40e933a8", "") in new stack
  == Spawn extension (4301, 1-CONGESTION, 2) exited non-zero on 'SIP/4301-40e933a8'
Jul 13 20:26:49 WARNING[833]: chan_unicall.c:2644 handle_uc_event: Unicall/1 event Drop call
Jul 13 20:26:49 WARNING[833]: chan_unicall.c:2644 handle_uc_event: Unicall/1 event Release call
    -- Unicall/1 released
Jul 13 20:26:49 WARNING[833]: chan_unicall.c:2644 handle_uc_event: Unicall/2 event Protocol failure
    -- Unicall/2 protocol error. Cause 32773
Jul 13 20:26:49 WARNING[833]: chan_unicall.c:2644 handle_uc_event: Unicall/3 event Protocol failure
    -- Unicall/3 protocol error. Cause 32773