[VoiceOps] WiFi SIP phones recommendations

Pete Mundy pete at fiberphone.co.nz
Tue Sep 22 19:19:28 EDT 2015

I think that part of the problem is that underlying wired backbone layer II network also needs to catch up on the port-change (possibly even switch-change) when the client is (invisibly) handed over to the new radio.

Think along the lines o 30-second MAC table timeout before broadcast occurs unless there is constant 2-way data through the tables on the necessary devices to immediately see the change (dependent on logical backbone layout).

The same problem exists with clients on non-.ah networks too.

IMHO DECT (even with repeaters) beats WiFi hands-down for voice.


On 22/09/2015, at 8:53 PM, Tim Bray <tim at kooky.org> wrote:

> On 21/09/15 20:40, Robert Johnson wrote:
>> Correct me if I'm wrong, but doesn't Ubiquiti's UniFi WiFi line do just
>> that? Is there something I'm missing when a client moves closer to AP
>> "B" and the network dynamically hands off the connection to AP "B"?
> In theory yes. Unifi Zero hand off does just this.  The client doesn't
> see the roam.
> Real life experience suggests the zero handoff isn't great in real world
> conditions.   I've spent a long time playing with it on a few sites, and
> given up.  Instead adjusting the minrssi system which pushes the client
> to make a roam.
> Maybe if you had very regular buildings, an isolated network for VoIP
> (separate access points and L2), no neighbours using WiFi, then it might
> be better,
> There are some new UniFI APs coming out, so will be interesting to see
> if they are any different.
> Tim
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