No subject

there is associated alarm detected.
 
I would like to know the following:
  
(1) After detecting an alarm, does the ISDN spec. specifies
    that all channels must be resetted or this is just an
    implementation choice which asterisk has made ?
 
    Should asterisk reset the line after detecting the alarm
    and caused all calls being drop? 
  
(2) I have a pri monitor ( ISDN tester) that sniffs the PRI
    line, I found that whenever the dropping calls problem
    happens,  the monitor print out "RDI Begin ...  SAMBE
   ,RESTART, RESTART ACK... RDI end".
   
Does anyone know what is RDI other than what stated in the
monitor's manual as "Remote Defect Detect" and
what causes it.
 
Attached is the  PRI intense debug file.
( http://www.geocities.com/mctiew/asterisk/bd2.txt )
  
Any pointer or help given is greatly appreciated !