[Asterisk-Users] Crc4 issues

[Paulo Mannheimer]

Hi All,

This is our 2nd E1 client that we try to use crc4 either with the e100p
or with the e405p without luck. 

After some trials, we ask the telco to switch off crc4 on their side and
everything works flawlessly.

Is there anything in the crc4 calculation that may be broken? We took a
look at wct1xxx.c and wct4xx.c but there doesn't seem to be much there
to be fixed (apparently the crc4 calculation is done within the chip
itself).

We also took a look at
http://lists.digium.com/pipermail/asterisk-cvs/2003-September/000126.htm
l but couldn't figure out what bits should we try to set to test other
card options.

Is there any documentation on the card that could help us?

Our zaptel looks like ...

span=1,0,0,ccs,hdb3,crc4

bchan=1-15,17-31
dchan=16

We already tried ...

span=1,1,0,ccs,hdb3,crc4
span=1,1,0,ccs,hdb3,crc4,yellow
span=1,0,0,ccs,hdb3,crc4,yellow