[Asterisk-Users] Outgoring spool

[Lorenzo Fascì]

Hi

I have to send 4 outgoing call, all from ZAP1/1   when
asterisk  start the first call, immediately it start all other calls
in the log I see

................................ Unable to request channel Zap/1/282
Jul 30 15:05:27 NOTICE[-1242534992]: pbx_spool.c:232 attempt_thread: 
Call failed to go through, reason 0

What I have to do to make asterisk make calls in sequence ?

Thank You

Bye
    Lorenzo