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Watching ISDN Channels
84
Interphase Corporation
Watching ISDN B Channels
N
OTE
Before establishing a call, you cannot know which ISDN B 
channel will be used. Therefore, to be sure to capture call 
data, you must activate traces for all the ISDN channels.
ISDN B channels are used to transmit data frames after an 
ISDN connection is established. The first few data frames 
exchanged between local and remote sites correspond to a 
second connection phase to allow the establishment of the 
upper layer (for example, the PPP protocol).
1. To activate watching on one ISDN B channel, select 
that channel in the configuration panel of the SynWatch 
dialog. 
To activate watching on all ISDN channels, select the 
PRI port related to the adapter (Port #0 or Port #1) in the 
configuration panel of the Synwatch dialog. 
A list of watch modes appears:
Figure B-3.  ISDN B Channel Watch Modes