[asterisk-users] Trying to understand Messages from chan_zap.c

[Daniel - Asterisk]

Hi friends,

Where can I get some information to understand messages like the following
ones?

*NOTICE[6455] chan_zap.c: PRI got event: HDLC Bad FCS (8) on Primary
D-channel of span 1*
*NOTICE[6455] chan_zap.c: PRI got event: HDLC Abort (6) on Primary D-channel
of span 1*
* ERROR[6455] chan_zap.c: !! Got S-frame while link down*
*ERROR[6458] chan_zap.c: !! Got reject for frame 27, retransmitting frame 27
now, updating n_r!*
*ERROR[6458] chan_zap.c: !! Got a UA, but i'm in state 7*
*ERROR[6455] chan_zap.c: ACK received for '1' outside of window of '0' to
'0', restarting*
* ERROR[6455] chan_zap.c: !! Not good - head of queue has not been
transmitted yet*
*ERROR[6457] chan_zap.c: !! Got reject for frame 52, but we only have
others!*

Yesterday I have had several voice problems with my calls but my telephone
provider says he had no problems then but I don't think so. Today everything
was fine and I didn't do any change.

I'm using Asterisk 1.4.21.1 (very good with queue delivery), Zaptel 1.4.11
and Digium T412P card.

Thanks in advance!

Daniel
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