[Asterisk-Users] Asterisk without D-Channel possible?

[Steve Underwood]

Peter Svensson wrote:

>On Wed, 1 Dec 2004, Steve Underwood wrote:
>
>  
>
>>Patrick wrote:
>>    
>>
>>>I'm running an Asterisk 1.0 server with 4 HFC cards and bri-stuff behind an
>>>"Anlagenanschluß" with 8 B-channels in Germany. It worked fine with Deutsche
>>>Telekom, but since we switched to Arcor nothing works at all.
>>>After some debugging, I called Arcor helpdesk who told me that they do not
>>>have a D-Channel and cannot signal one at my request either.
>>>
>>>Is it possible to use Asterisk without a D-Channel? What should my
>>>zaptel.conf and zapata.conf look like?
>>> 
>>>
>>>      
>>>
>>Sure its possible. It isn't much use, though :-)
>>
>>The D channel carries the signalling. No D channel, no call control. You 
>>just have 8 open, but useless voice channels.
>>    
>>
>
>Maybe he has NFAS (Non Facility Associated Signalling) where the D channel 
>on one of the BRI lines handles the signalling for the B channles on all 4 
>BRIs.
>
>There is support for NFAS in Asterisk via "trunkgroups" in the zapata.conf 
>config file. I have no idea if this works for bri-stuff as well. It may, 
>since both are zapata devices.
>  
>
I think NFAS would be a pretty unusual thing for BRI. However, he said 
he has *no* D-channel. With NFAS he would have at least one.

Steve