No D-channels available! Using Primary channel 16 ...

/var/log/asterisk/full

chan_zap.c: PRI got event: HDLC Bad FCS ( on Primary D-channel of span 1
chan_zap.c: PRI got event: HDLC Abort (6) on Primary D-channel of span 1
...
chan_zap.c: Detected alarm on channel 1: Yellow Alarm
chan_zap.c: Unable to disable echo cancellation on channel 1
...
chan_zap.c: PRI got event: Alarm (4) on Primary D-channel of span 1
chan_zap.c: No D-channels available! Using Primary channel 16 as D-chann
el anyway!
chan_zap.c: Alarm cleared on channel 1
...
chan_zap.c: PRI got event: No more alarm (5) on Primary D-channel of span
1
chan_zap.c: PRI got event: HDLC Abort (6) on Primary D-channel of span 1
chan_zap.c: PRI got event: HDLC Abort (6) on Primary D-channel of span 1
chan_zap.c: PRI got event: HDLC Bad FCS ( on Primary D-channel of span 1

It drops calls when this happens ...

Any idea ?

/etc/zaptel.conf

# Span 1: WCT1/0 "Digium Wildcard TE110P T1/E1 Card 0" HDB3/CCS
span=1,1,0,ccs,hdb3
bchan=1-15
dchan=16
bchan=17-31

Hello, Pedja:
could you post your zaptel.conf, zapata.conf and extensions.conf and asterisk logs?
regards,
James.zhu

I use OpenVox revised Trixbox with E1 telco line ...
attached are conf files.

Thanks
Pedja

hello, Pedja:
the config are ok. you can check the some reference for your problem. 1) kb.digium.com/entry/37/71/ 2) please check the hdparm and make sure it is in right setting for example set to UDMA2 mode.
Regards,
James.zhu

Telco company solved my problem. The line was not ok, some piece of hardware in the telco was broken ....

Plz post here what was the problem with your telco hardware. I got the same errors, but my telco said it's my hardware problems...