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 <[EMAIL PROTECTED]> Potential Technologies
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