asterisk users - Oct 2016 - Asterisk inside network. What phone works well?

Hello list,

I have Asterisk running well inside our network. I did some experiments exposing
it to internet but had some issues:
1. NAT issues (voice one way, etc). From what I understand double-NAT users will
always have something like this
2. Immediately I see people trying to hack into. I did configure Fail2Ban and it
works somewhat, but not 100%. Erroneous logs, etc

So.. I ended up closing network. Currently most users inside network. My home
router have GRE tunnel to office so phone works just fine.
Another user uses VPN and soft phone and it works good too.

Now I need to setup some users with actual phone devices and none of those
solutions will work. So, I did some research and found
that some phones have VPN capability built in. 

Right now I use Cisco SPA504G phones. We have auto-provisioning for them, works
well. But I don?t think they have VPN capability.


What I found it that Cisco 525g2 has AnyConnect functionality (SSL VPN) but not
sure if this is what I need.

We have Mikrotik router. Can I setup VPN on router and have this Cisco phone
auto-dial VPN and then connect to Asterisk? I?m asking to see if this will work
before I go in and buy that phone.
Or maybe there is other devices/solutions you suggest? I?d like to stay with
Cisco because I?m somewhat familiar with provisioning those..

Thank you
Ivan

> I have Asterisk running well inside our network. I did some 
> experiments exposing it to internet but had some issues:
> 1. NAT issues (voice one way, etc). From what I understand double-
> NAT users will always have something like this
> 2. Immediately I see people trying to hack into. I did configure 
> Fail2Ban and it works somewhat, but not 100%. Erroneous logs, etc
> 
> So.. I ended up closing network. Currently most users inside 
> network. My home router have GRE tunnel to office so phone works just 
fine.
> Another user uses VPN and soft phone and it works good too.
> 
> Now I need to setup some users with actual phone devices and none of
> those solutions will work. So, I did some research and found 
> that some phones have VPN capability built in. 
> 
> Right now I use Cisco SPA504G phones. We have auto-provisioning for 
> them, works well. But I don?t think they have VPN capability.
> 
> 
> What I found it that Cisco 525g2 has AnyConnect functionality (SSL 
> VPN) but not sure if this is what I need.
> 
> We have Mikrotik router. Can I setup VPN on router and have this 
> Cisco phone auto-dial VPN and then connect to Asterisk? I?m asking 
> to see if this will work before I go in and buy that phone.
> Or maybe there is other devices/solutions you suggest? I?d like to 
> stay with Cisco because I?m somewhat familiar with provisioning those..
I haven't done this myself, but I think what you need to look at is phones 
that can do IPSEC vpn setups.

For the Mikrotik router, this may be helpful to start investigating:
http://wiki.mikrotik.com/wiki/L2TP_%2B_IPSEC_between_Mikrotik_router_and_a_PC

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On Thu, Oct 13, 2016 at 12:06 PM, <kevin.larsen at pioneerballoon.com>
wrote:
> > I have Asterisk running well inside our network. I did some
> > experiments exposing it to internet but had some issues:
> > 1. NAT issues (voice one way, etc). From what I understand double-
> > NAT users will always have something like this
> > 2. Immediately I see people trying to hack into. I did configure
> > Fail2Ban and it works somewhat, but not 100%. Erroneous logs, etc
> >
> > So.. I ended up closing network. Currently most users inside
> > network. My home router have GRE tunnel to office so phone works just
> fine.
> > Another user uses VPN and soft phone and it works good too.
> >
> > Now I need to setup some users with actual phone devices and none of
> > those solutions will work. So, I did some research and found
> > that some phones have VPN capability built in.
> >
> > Right now I use Cisco SPA504G phones. We have auto-provisioning for
> > them, works well. But I don?t think they have VPN capability.
> >
> >
> > What I found it that Cisco 525g2 has AnyConnect functionality (SSL
> > VPN) but not sure if this is what I need.
> >
> > We have Mikrotik router. Can I setup VPN on router and have this
> > Cisco phone auto-dial VPN and then connect to Asterisk? I?m asking
> > to see if this will work before I go in and buy that phone.
> > Or maybe there is other devices/solutions you suggest? I?d like to
> > stay with Cisco because I?m somewhat familiar with provisioning
those..
>
> I haven't done this myself, but I think what you need to look at is
phones
> that can do IPSEC vpn setups.
>
> For the Mikrotik router, this may be helpful to start investigating:
> http://wiki.mikrotik.com/wiki/L2TP_%2B_IPSEC_between_
> Mikrotik_router_and_a_PC
>
I have Asterisk installs behind Vyatta (linux iptables) and pfSense
(freebsd pf) NAT routers and majority of the time there are no issues with
phones outside the network. My go to phones are Polycom VVX series or
X-Lite / Bria softphones. The key is to make sure you have configured
Asterisk sip.conf with the externip= and nat=yes settings. Additionally on
the NAT routers that the outside phones are behind SIP ALG should be
disabled.

Ryan
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