[VoiceOps] SIP door intercom-phones

[Carlos Alvarez]

Thanks to everyone who replied, both on and off list.  I went with the Algo
8028.  Why?

Doesn't expose ethernet to the outside, only two audio wires.
Cheap/rugged outside piece.
Great price.
Available from my preferred distributor, Netx.
Specs meet exactly what they asked for with no fluff (no video, no keypad,
etc)
Very highly reviewed elsewhere.

How do most people program these to ring into the office phones?  I'm
thinking that they will all ring the main "reception" people at each
customer location for a few rings, and then roll over to ringing the entire
(or most of) the facility.


On Wed, Jul 13, 2016 at 10:19 AM, Tim Bray <tim at kooky.org> wrote:

>
>
> On 13/07/16 16:20, Zilk, David wrote:
> > I would be hesitant to extend an Ethernet connection for a SIP phone >
> outside of the secured building perimeter without mitigating the >
> potential security risks to the network.  Much better to use one of > any
> number of existing products which use an analog phone line; and > connect
> it back to an ATA located within the perimeter.
>
> It is maybe an issue.   So somebody opens the door phone, get's the
> ethernet out and then connects to your network.
>
> It is no more an issue of telling your staff the wifi access password and
> they tell their friend.
>
> I've seen a product where the anti tamper on the device connects back to
> relay in the ethernet wire further back.  With a latch on failure.  Or you
> could just put that cable into it's own vlan.
>
>
> If you chat to installers of many of these devices, they will describe
> them as `access control` rather than `security`.
>
> Meaning, ok to stop a random wandering off the street.  Not going to stop
> a determined person.
>
> In my office, we use a 2N on the front door.  But at night it (and it's
> cat5) is covered by a locked security shutter.
>
>
> Tim
>
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