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Not sure if I have a dialplan issue or what I have sufficient lines it appears that occassionally when it tells asterisk what numbers to dial asterisk cannot properly tell how many available channels there are and that it needs to rollover to the next T1.

Here is my dialplan any ideas?

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exten => _1NXXNXXXXXX,1,Dial(Zap/g4/${EXTEN}||o)
exten => _1NXXNXXXXXX,2,Dial(Zap/g6/${EXTEN}||o)


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    -- Executing Dial("Local/16566809120@default-6bec,2", "Zap/g4/16566809120||o") in new stack
Aug  7 10:57:38 NOTICE[29939]: app_dial.c:1049 dial_exec_full: Unable to create channel of type 'Zap' (cause 34 - Circuit/channel congestion)
  == Everyone is busy/congested at this time (1:0/1/0)
    -- Executing Dial("Local/16566809120@default-6bec,2", "Zap/g6/16566809120||o") in new stack
    -- Called g6/19286809120
  == Parsing '/etc/asterisk/manager.conf': Found
  == Manager 'sendcron' logged on from 127.0.0.1
    -- Executing Dial("Local/16568544346@default-7054,2", "Zap/g4/16568544346||o") in new stack
Aug  7 10:57:38 NOTICE[29943]: app_dial.c:1049 dial_exec_full: Unable to create channel of type 'Zap' (cause 34 - Circuit/channel congestion)
  == Everyone is busy/congested at this time (1:0/1/0)
    -- Executing Dial("Local/16568544346@default-7054,2", "Zap/g6/16568544346||o") in new stack
    -- Called g6/16568544346
  == Parsing '/etc/asterisk/manager.conf': Found
  == Manager 'sendcron' logged on from 127.0.0.1
    -- Executing Dial("Local/16567642662@default-6531,2", "Zap/g4/16567642662||o") in new stack
Aug  7 10:57:38 NOTICE[29949]: app_dial.c:1049 dial_exec_full: Unable to create channel of type 'Zap' (cause 34 - Circuit/channel congestion)


Zaptel can sometimes take a few seconds to clear a line before it will allow dialing on that line. This depends on yoru carrier and the kind of lines you have, but there's not much you can do about it. Using PRI circuits instead of RBS is one thing you can do since PRIs are faster at signalling.

Send Me The Output Of :
ztcfg -vvvvv

And which card r u using for zap.