asterisk users - Aug 2005 - Phone hangups after a TEI check request

Hello,

I am using asterisk with a HFC-Card which is connected to the internal S0 of a 
Siemens Hi Path 3000. When asterisk receives a TEI check request an active 
call to the PSTN ends. Does someone know this problem? I tried 
bri-stuff.0.1.0-RC4a, bristuff-0.2.0-RC8h and bristuff-0.2.0-RC8m. There is 
always the same error:

  == Primary D-Channel on span 1 up
  == Primary D-Channel on span 1 up
received TEI check request for TEI = 64
received TEI check request for TEI = 64	
  == Primary D-Channel on span 1 down
  == Primary D-Channel on span 1 up

Thanks for your help.

Achim