CASE 1 -  CALL REJECTED

PeriK*CLI>
    -- Registered IAX2 'iaxbrownsville' (AUTHENTICATED) at 12.13.X.X:1024
PeriK*CLI> console dial 2700
  == Console is full duplex
    -- Executing [2700@local:1] Dial("Console/dsp", "IAX2/iaxvallejo:iaxvallejo@iaxbrownsville/0@default") in new stack
    -- Called iaxvallejo:iaxvallejo@iaxbrownsville/0@default
    -- Call accepted by 12.13.X.X (format gsm)
    -- Format for call is gsm
    -- IAX2/iaxbrownsville-26252 is circuit-busy
    -- Hungup 'IAX2/iaxbrownsville-26252'
  == Everyone is busy/congested at this time (1:0/1/0)
    -- Executing [2700@local:2] Congestion("Console/dsp", "") in new stack
PeriK*CLI> console hangup
________________________________________________________________________________
CASE 2 - CALL ACCEPTED

	-- Registered IAX2 'iaxbrownsville' (AUTHENTICATED) at 12.13.X.X:4569
PeriK*CLI> console dial 2700
  == Console is full duplex
    -- Executing [2700@local:1] Dial("Console/dsp", "IAX2/iaxvallejo:iaxvallejo@iaxbrownsville/0@default") in new stack
    -- Called iaxvallejo:iaxvallejo@iaxbrownsville/0@default
    -- Call accepted by 12.13.X.X (format gsm)
    -- Format for call is gsm
    -- IAX2/iaxbrownsville-26202 is ringing
PeriK*CLI> console hangup


My config on both PBXs:
bindport=4569