> Data Link Connection. It's the logical connection between two entities
on
> the
> channel. A Datalink connection must be established before a reliable
data
> exchange may be done.
> 
> It's what libpri (in a somewhat inappropriate way) calls "D-channel
> Up/Down".
> 
> > It seems to me, that asterisk/visdn sends only, but does not receive
any
> > data via the isdn link.
> 
> Yes, if the channel is mute, you will see something like:
> 
> q931 visdn1.0:TEI[0]: DLC is disconnected, requesting connection
> q931 visdn1.0:TEI[0]: DLC is awaiting connection: message queued
> ...
> q931 visdn1.0:TEI[0]: DL-RELEASE-INDICATION
> 
> Otherwise you will see a DL-ESTABLISH-CONFIRM

What do you mean with "...the channel is mute..."? Simply unavailable or
"muted" by some sort of software/ config setting?

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