[Asterisk-Users] WI FI IP phones??

[James Moran]

Well there's alot to think about and research thanks.

On Fri, 2004-05-07 at 22:44, Jonathan Moore wrote:
> Not sure if my other message got through. Wifi limitations with voip are a
> function of # of concurrent active calls per access point (in addtion to which
> codecs used). A single floor of the hospital might have many many access points.
> If you just need a way to contact nurses on call, my guess is you would never
> have all 30 phones active at once. This would be in your favor, since just
> having a phone on and in standby is not going to eat up much bandwidth. Howeve
> since peoples lives may be on the line the network would need to be really well
> engineered and coverage would need to be designed with concurrent calls in mind
> rather than the usual testing for signal strength.
> 
> In addition to the generel active calls/AP issue there are protocols like SVP,
> Spectra Link Protocol, that provide for some type of quality of service for
> Wifi. I don't really recomend Spectra link, mainly because they wanted a $5000
> commitment just to demo their product. 
> 
> There is a qos spec for qos on wifi in the works, this won't magically make you
> able to have more calls per AP, but it might help calls in session from being
> starved out. I am pretty sure that what you want to do can be done at least with
> the Spectra stuff, since I have talked to tech director of a new middle school
> that is using this for their phone system. Every classroom teacher has one of
> these and I think most of the other phone users in the building.
> 
> Another little trick floating around is for the Linksys APs. Again not
> necessarily recommending but there are custom firmware images (since they run
> Linux) that provide QOS, I think there may even be an image with a builtin SIP
> proxy.
-- 
James Moran <jmoran at potentialtech.com>
Potential Technologies