-- User entered '141496920000'
    -- Executing [s@from-nec:5] Dial("DAHDI/31-1", "DAHDI/g2/141496920000,,T") in new stack
    -- Requested transfer capability: 0x00 - SPEECH
    -- Called g2/141496920000
    -- DAHDI/32-1 is proceeding passing it to DAHDI/31-1
    -- Channel 0/1, span 2 got hangup request, cause 31
[Nov 16 15:12:56] WARNING[7990]: app_dial.c:827 wait_for_answer: Unable to forward voice or dtmf
    -- Hungup 'DAHDI/32-1'
  == Everyone is busy/congested at this time (1:0/0/1)
    -- Auto fallthrough, channel 'DAHDI/31-1' status is 'CHANUNAVAIL'
    -- Channel 0/31, span 1 got hangup request, cause 16
    -- Hungup 'DAHDI/31-1'



New extensions.conf:

[from-nec]
exten => s,1,Answer()
exten => s,n,Set(TIMEOUT(digit)=2)
exten => s,n,Set(TIMEOUT(response)=5)
exten => s,n,Read(DialedNumber)
exten => s,n,Dial(DAHDI/g2/${DialedNumber},,T)