[Asterisk-Users] /var/spool/asterisk/outgoing issues

[ast at uc9.net]

I am running about 300 calls at the same time though pbx_spool.

I am getting these error messages.  Where you see the Call failed to go 
though reason 5, the call is dropped and never tried again.  I looked at 
the source code in ./pbx/pbx_spool.c and on line 199 I see the message but 
I can't figure out what the error 5 is or how to fix it.  

Can anyone help?

Feb  5 19:36:20 NOTICE[1318382384]: pbx_spool.c:199 attempt_thread: Call
failed to go through, reason 5
    -- Call accepted by 66.225.202.72 (format GSM)
    -- Format for call is GSM
Feb  5 19:36:20 NOTICE[1335167792]: pbx_spool.c:199 attempt_thread: Call
failed to go through, reason 5
Feb  5 19:36:20 NOTICE[1343560496]: pbx_spool.c:199 attempt_thread: Call
failed to go through, reason 5
    -- Hungup 'IAX2[NuFone]/22'
    -- Call accepted by 66.225.202.72 (format GSM)
    -- Format for call is GSM
    -- Hungup 'IAX2[NuFone]/23'
Feb  5 19:36:20 NOTICE[1351953200]: pbx_spool.c:199 attempt_thread: Call
failed to go through, reason 5
    -- Call accepted by 66.225.202.72 (format GSM)
    -- Format for call is GSM
Feb  5 19:36:20 NOTICE[1360345904]: pbx_spool.c:199 attempt_thread: Call
failed to go through, reason 5
    -- Call accepted by 66.225.202.72 (format GSM)
    -- Format for call is GSM
    -- Hungup 'IAX2[NuFone]/24'
    -- Hungup 'IAX2[NuFone]/25'
    -- Call accepted by 66.225.202.72 (format GSM)
    -- Format for call is GSM
    -- Hungup 'IAX2[NuFone]/26'
Feb  5 19:36:20 NOTICE[1276418864]: pbx_spool.c:199 attempt_thread: Call
failed to go through, reason 5