[VoiceOps] WiFi SIP phones recommendations

[Aaron Seelye]

On 9/19/15 8:42 AM, Jay Ashworth wrote:
> ----- Original Message -----
>> From: "Alex Balashov" <abalashov at evaristesys.com>
>
>> On 09/08/2015 03:35 PM, Carlos Alvarez wrote:
>>
>>> Every Wifi phone I've tried will roam just fine between APs assuming
>>> the APs are properly configured.
>>
>> Really? Can this take place seamlessly mid-call? With DHCP? What about
>> DHCP lease acquisition delay?
>
> An access point is an L1 bridge; everyone on the wireless side of every
> AP are all on the same LAN with the same addressing.
>
>> Would such a configuration involve merely bridging all the APs on the
>> same LAN segment so that the same DHCP server feeds them? If so, where's
>> the guarantee that the DHCP server will lease out the same IP address
>> to the client?
>
> Access points.  Not routers.

This implies that a level of intelligence/sophistication is (or isn't) 
in the client unit that when it bounces to a new AP it wouldn't run a 
refresh on the lease.  It would be very reasonable to think that an AP 
with the same name might be on a different subnet (different 
regions/depts of a large building, or whatever), which would then render 
the call dead.

What you're suggesting is intelligent handoffs similar to a cellular 
network.

-Aaron