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

[Eric "ManxPower" Wieling]

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.
> 
> 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.

"stop gracefully" does something similar.