The endpoints do not have a fixed IP, and a VPN tunnel wouldn't work under this 
scenario.  Basically this setup is for people who are traveling, and may be 
using a smart phone at an airport (or something similar).  The idea is that our 
system can be used to reduce toll costs, and provide access to internal 
resources. 

Thank you for the recommendations on fail2ban, IPtables, and the device naming 
scheme... I am not overly found of having a device name (ex: 101) that 
corresponds to the extension being used,  so I will be using user and devices 
under freebpbx to name them differently. 


-----Original Message-----
From: "Administrator TOOTAI" <ad...@tootai.net>
Sent: Thursday, October 17, 2013 6:56am
To: asterisk-users@lists.digium.com
Subject: Re: [asterisk-users] Access PBX from internet - best practice

Le 17/10/2013 12:30, richard.seg...@marisec.ca a écrit :
> Hello,

Hello

>
> I have a question about best practice (or recommended practice) for allowing 
> SIP registrations from the Internet.

Registrations from Internet is vague:

- are EP with fixed IP: define the extension in SIP.conf with host = <EP 
IP>. You can even add an iptables rule to allow the <EP IP> to connect 
to port 5060 in udp (if your setup is this one)
- are EP travellers => fail2ban or through VPN. OpenVPN is a good solution.

> This is what I was thinking of implementing:
> 1. Use OpenSips for the SBC,  enable SRTP and TLS

All clients doesn't support SRTP

> 2. Allow limited access to the actual Asterisk PBX (behind firewall) via 
> OpenSips
>
> Is there anything that I am missing that probably should be implemented?

In all cases I would recommend:

- a strong extension definition eg [MyFav0Rite-prefiX_123] instead of [123]
- always use fail2ban

  [...]

-- 
Daniel

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