[asterisk-dev] Re: How to busy out PRI channels?

[Greg Boehnlein]

On Tue, 31 Oct 2006, Alistair Cunningham wrote:

> Morten Isaksen wrote:
> > What happens when you put a channel in service mode when there is a 
> > active call? Is the call disconnected or is the service mode first 
> > applied when the channel becomes idle?
> 
> Many enterprise products have an option to quiesce a trunk. Any inactive 
> B channels are disabled immediately, and any active channels are 
> disabled as soon as the call on them finishes. When all B channels on a 
> trunk are disabled, the trunk is too. NFAS groups work similarly.

Yes.. this was an absolute neccessity for maintenance windows back in the 
ISP days, where we would have to put a span into "last call" mode so that 
it would clear out before we tested the PRI. It would be really nice to 
see this feature implemented at both the channel and the span level. I.E. 
being able to busy out a specific channel or group of channels in addition 
to the entire span.
 
> When I was an engineer working mostly with IBM Websphere Voice Response, 
> and we wanted to take a machine down, we would quiesce the trunk(s) as 
> above, then wait until only 1 or 2 calls were left, then cut off these 
> remaining calls. We felt this was the best compromise between cutting 
> off as few callers as possible, and minimising the time the system was 
> unavailable to new callers.
> 
> A facility to do this in Asterisk would be most welcome.
> 
> Alistair Cunningham
> +1 888 468 3111
> +44 20 799 39 799
> sip:acunningham at integrics.com
> http://integrics.com/
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