[asterisk-users] cat /proc/zaptel/*

[Jaap Winius]

Hi all,

Thanks to Russ Meyerriecks for his previous reply in this thread,  
which was very informative. I'm now hoping that someone will comment  
on the following:

"ISDN uses LAPD for the D-channel and LAPB for data connections over  
the B-channels. However, LAPB is irrelevant for Asterisk, because when  
the B-channels are used for voice they carry no signaling. This is why  
it is necessary to specify a line code protocol, such as AMI, for the  
B-channels, and a frame type, typically CCS, for the D-channel."

Would that statement be correct? Also, would someone care to elaborate  
on how the CCS protocol fits into this picture, in particular how it  
relates to LAPD?

Thanks,

Jaap