asterisk users - Dec 2008 - ERROR[31152] chan_capi.c: Could not write to pipe for ISDN4#02

Hello,

we are using an EICON/DIALOGIC DIVA Server 4BRI together with asterisk 
1.4.21.2 and chan-capi-head (20-11-2008)

 From time to time error messages like the following appear several 
times in /var/log/asterisk/messages:

ERROR[31152] chan_capi.c: Could not write to pipe for ISDN4#02

Is that something I should worry about? Could this be a problem with the 
ISDN card or with the phone line?

Thanks for your help,

Stefan
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