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

[Alistair Cunningham]

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.

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
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