Oh, don't worry about us going cheap on security. We use A2Billing
(along with some Fail2Ban configuration for bad logins) to limit the
number and cost of calls that can go out through a compromised SIP
account, so that when, not *if*, a customer's SIP account gets
compromised, the attacker gets cut off at the knees before they can even
get out the door. We've even added bogus connection charges on
international calls that get removed before we bill our customers, to
speed up the process and reduce our losses even further. Our customers
are even happy that these billing limits are in place.
No, this is all about playing nice with our load balancing software and
protecting databases and backend servers that have no business being
available to the public. But mostly it's about the load balancer
(IPTables on said servers can take care of "visible to the public). I
just want to make sure that the router we use will play nice with
Asterisk, since we've already seen network hardware that looks good on
paper, but fails miserably in practice. In fact, we see it so often with
individual customers' crap routers causing voice quality issues, that by
default we don't trust simple math.
So here I am, asking everyone what router they use, and whether you're
happy with the results when there's 100 simultaneous SIP calls in
progress. I want to know what happens when the rubber hits the road.
On 2015-11-20 14:22, Telium Technical Support wrote:
Well router and firewall are very different...it depends on what you
are
trying to accomplish.
If you are trying to secure an Asterisk-based call center, get a real
security product. Look here for details:
http://www.voip-info.org/wiki/view/Asterisk+security
This covers firewall, Asterisk lock-down, and Asterisk specific
security.
The average break-in/fraud cost is $25,000 per day. (watch the
Astricon
videos for more details). So going cheap on security isn't a smart
move for
a commercial installation.
If you just want a router/switch, figure out the simultaneous call
capacity
x codec demands in bps, and there is your backplane switching speed
requirements. Even with 100 simultaneous calls at g711, a lower end
Cisco
(3xx) router/switch will have no problem.
-M-
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Ernie
Dunbar
Sent: Friday, November 20, 2015 3:25 PM
To: Asterisk Users
Subject: [asterisk-users] Which router/firewall would you use for a
virtual-PBX Asterisk installation?
Hi everyone.
We've got a fairly large base of customers who use our Asterisk server
for phone service in a virtual PBX kind of way, where the server is
security hardened and exposed to the internet for them to connect to
remotely with SIP and IAX. It's certainly not the sort of affair where
we're running it as a PBX just within the building. As a result, we see
network traffic coming through eth0 between 512 Kbps and about 3.0
Mbps,
depending on the time of day.
We haven't so far been using a hardware firewall/router on our server
network, but it's becoming increasingly clear that we need to. We have
enough experience to know that Asterisk is pretty sensitive when it
comes to network hardware in our situation - we've had to replace one
otherwise perfectly good 100 Mbps network switch because it simply
wasn't able to keep up with the amount of streaming audio we put
through
it, and it badly affected voice quality. We have other traffic flowing
through our server network too, including a significant amount of
e-mail
and web traffic, although that's not quite as sensitive to the quality
of our network hardware.
If you've got these large requirements for Asterisk, I'd love to hear
what you use for a router, and whether that router has met your needs.
It would also be nice to hear about what kinds of routers to avoid that
you may have tried in the past and found lacking.
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