On 07/14/2011 06:57 PM, Bruce Ferrell wrote:
Does it work? Or do timing issues mess with audio?
It does, to a point. You will definitely see problems at higher
concurrent call volumes, and there is no question that concurrent call
limits reachable in such an environment are lower than on bare metal.
You will also need to configure Asterisk to deal with the fact that
EC2 instances have a private IP address homed on the network interface
and a public IP DNAT'd to it 1-to-1. The 'externip' parameter in
sip.conf can be used to do that.
Actual experiences will vary greatly depending on the exact physical
hardware node on which your VM is provisioned, just how viciously
oversubscribed it is, and the I/O demand of other users. A lot of it
is a matter of luck.
For a small, infrequently used PBX, it will probably work fine.
Nir Simionovich has a more optimistic take, having utilised EC2
instances for short-term outbound dialing campaigns based on Asterisk.
Here is a link to his Amoocon 2009 presentation on the topic:
http://www.simionovich.com/2009/05/14/asterisk-and-amazon-ec2-amoocon-presentation/
Perhaps it is a case where the economic benefit of "elastic" resources
that can be ramped up to meet demand outweighs the opportunity costs
of the aforementioned inconsistency.
--
Alex Balashov - Principal
Evariste Systems LLC
260 Peachtree Street NW
Suite 2200
Atlanta, GA 30303
Tel: +1-678-954-0670
Fax: +1-404-961-1892
Web: http://www.evaristesys.com/
--
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