[asterisk-users] Callerid Error

[John Meksavan]

Asterisk Users,

  I am running a Debian "Etch" system with Asterisk 1.4.11 with a TDM03B card.  Once in awhile, I get this error on the Asterisk, which causes my channels to be busy/congested, leaving me with just one channel to recieve and make calls:

NOTICE[31454]: chan_zap.c:6367 ss_thread: Got event 17 (Polarity Reversal)...
WARNING[31454]: chan_zap.c:6499 ss_thread: CallerID returned with error on channel 'Zap/3-1'          

  What could be causing this issue?  Any would input would be greatly appreciated.   

Thanks In Advance,
John   

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