[asterisk-users] Wifi - Managed access points...

[Bruce Reeves]

Wai,

The IP address is really on the access points, since they are the SIP
part of the solution. Let me see how well I can explain this, The
access points register to a manager application, running on one AP,
and the phones have a hard coded DECT id and register to the same
manager app. The manager actually performs the connection to the
Asterisk system and all the access points have IP's and each phone an
account on Asterisk. In a handover the manager app routes the SIP
traffic to the AP that the handset is on and as the caller moves the
phone detects other AP's and picks a new AP. That AP coordinates with
the manager app to re-route the sip/rtp. In testing so far, you cannot
tell the hand off occurred, even while watching the signal meters on
the phone, there is no noticeable audio loss. There has to be a fair
overlap in coverage, they say around -60db to -70db in signal you
should have another AP and the phone can see up to 4 APs at a time.
Each AP can handle 8 voice channels so you have to keep that in mind
also. So did that make sense.

<== Little Commercial blip ==>

Aastra requires people be certified resellers on this solution to
purchase\sale it. In that process they give a fantastic amount of
attention to planning a wireless deployment. Nortex is a certified
reseller of the Aastra SPI-DECT solution.

<==End of blip ==>

On 10/10/07, Wai Wu <wkwu at calltrol.com> wrote:
> Hope you don't mind I jump in here. I am interested in DECT's handover
> of live calls. My question is, does the IP address on the phone change
> when moving from on access point to another?
>
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Bruce
> Reeves
> Sent: Wednesday, October 10, 2007 9:20 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [asterisk-users] Wifi - Managed access points...
>
> Luis,
>
> Like Ron, I have tested deploying several different handsets and have
> been disappointed. I am currently testing a deployment with a DECT
> system by Aastra that uses multiple access points the talk SIP to
> Asterisk and DECT to the handset. Being based on DECT they have good
> battery life and handover of live calls between points is a key feature.
> Pricing is along the same as what I would pay for High end access points
> and good handsets. There are systems like this coming out from Aastra,
> Snom, Polycom/Kirk and probably some others. If I were going to deploy
> the setup you are talking about I would check this option out before
> jumping solely on wifi. If you want contact me off list and I'd be happy
> to visit in more detail.
>
> On 10/10/07, Luis Antonio Prata Barbosa <luispratalistas at gmail.com>
> wrote:
> > Hi,
> >
> > I'm working on a Wifi VoIP project specification. It will have almost
> > 8 APs and 20-30 wifi phones.
> >
> > And after some research, I still having some questions ...
> >
> > 1) Are Managed Access Points (and switch controllers) really important
>
> > to implement good wifi woip (w/ low latency and acceptable handover
> time) ?
> >
> > 2) What is the difference between (3com WX1200 + 3com AP 3750) and
> > (DES-1228P + DWL-3140AP) ???
> >
> > 3) 3com says their AP implements WMM ...  and DLink says they priorize
>
> > VoIP traffic based on VLAN ... are those methods the same ?
> >
> > Thank you,
> >
> > Luis A P Barbosa
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>
>
> --
> Bruce Reeves
> Nortex Networks
>
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-- 
Bruce Reeves
Nortex Networks