Ok, what about a VPN server box (Mikrotik or otherwise) which also runs dynamic DNS?
The VPN client box connects to the dynamic hostname.

Their IT dept will still need to forward traffic to the VPN server, but that's/all /they would need to do.  They don't even need to have a static IP. For your part, you don't need to know what their IP's are.  You could preconfigure a server box with a dyn hostname like "voiptunnel-1" and then provide one or more client side boxes which are already configured to open a tunnel to "voiptunnel-1".

If you want to use this client box at a random hotel, then it needs to support being a wifi client bridge and have a simple way for the traveler to set the SSID and/or key.  Mikrotik can certainly do the job, but I don't think it would be simple enough for any given business traveler.

Just a couple cents.

-Adam



On 7/2/2018 2:28 PM, [email protected] wrote:
OK, but at the far end it would be good to have a small piece of hardware too rather than depend on VPN software running on some random server.  I would rather not bother the various IT folks at these different companies that all run asterisk.
*From:* Trey Scarborough
*Sent:* Monday, July 2, 2018 12:19 PM
*To:* [email protected]
*Subject:* Re: [AFMUG] OT AASTRA remote via vpn

yep small mikrotik....


On 7/2/2018 1:14 PM, [email protected] wrote:
Let’s say I am in a random hotel room and I want to use my Aastra phone back to my office asterisk.
That is similar to what I need to accomplish.
*From:* Sean Heskett
*Sent:* Monday, July 2, 2018 11:55 AM
*To:* AnimalFarm Microwave Users Group
*Subject:* Re: [AFMUG] OT AASTRA remote via vpn
Instead of a vpn it might be better to just allow it to connect through the firewall (assuming you are able to manage the firewall)
On Mon, Jul 2, 2018 at 1:32 PM <[email protected]> wrote:

    Other way around, I want to use my Aastra from my home office but
    I want it to connect to two other companies’ business office
    asterisk systems.
    *From:* Sean Heskett
    *Sent:* Monday, July 2, 2018 11:06 AM
    *To:* AnimalFarm Microwave Users Group
    *Subject:* Re: [AFMUG] OT AASTRA remote via vpn
    Hey Chuck,
    What about using a sip client app on your mobile phone?  You can
    turn on vpn on the phone.
    Or do you want an actual desk phone?
    -sean
    On Sun, Jul 1, 2018 at 11:33 AM <[email protected]> wrote:

        I wonder what the simplest and cheapest method is to use an
        Aastra SIP phone while away from the office.  Our Asterisk is
        on private IP space so I have to have the phone tunnel into
        my internal LAN.  There are firewall boxes available that
        will do this.
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