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

[Adam Robins]

When we were testing failover among multiple machines, we found that
stopping Asterisk does not cause the carrier to see the trunks as
unavailable.  They continue to send inbound calls over PRI.  Only
killing zaptel or powering down the server made the carrier roll over to
another trunk group.  This definitely is a gap in our business
continuity plan.

-----Original Message-----
From: asterisk-dev-bounces at lists.digium.com
[mailto:asterisk-dev-bounces at lists.digium.com] On Behalf Of Alistair
Cunningham
Sent: Wednesday, November 01, 2006 8:31 AM
To: Asterisk Developers Mailing List
Subject: Re: [asterisk-dev] Re: How to busy out PRI channels?

Eric "ManxPower" Wieling wrote:
> Alistair Cunningham wrote:
>> 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.

It's similar, but not quite the same in a clustered environment. When
the B channels are busied out, this tells the upstream switch to route
calls to another machine in the cluster. Stop gracefully will still
accept calls from the switch (I believe, it's been a while since I
tested this).

Alistair Cunningham
+1 888 468 3111
+44 20 799 39 799
sip:acunningham at integrics.com
http://integrics.com/
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