Reversing polarity

My log is full of this kind of event:

[2009-10-08 08:15:51] DEBUG[12050] chan_zap.c: Ignoring Polarity switch to IDLE on channel 6, state 6
[2009-10-08 08:15:51] DEBUG[12050] chan_zap.c: Polarity Reversal event occured - DEBUG 2: channel 6, state 6, pol= 0, aonp= 0, honp= 0, pdelay= 600, tv= 852100917

What does it mean?

hello:
It is just a debug, i do not think that it would cause any problems.
Does your pstn line have reverse polarity application? If it does, please try to set:
answeronpolarityswitch=yes
hanguponpolarityswitch=yes
in zapata.conf.

Hello, yes that solved my problem. Also, the problem with no carrier detected signal resolved with this. Thank you very much.