[Freeswitch-users] recommendations for Wifi SIP phones?

[Kevin Wormington]

Karl, I think what Michael means is that SIP is a signaling protocol and 
would having nothing to do with audio issues.  If google voice or skype 
work on a wifi link and SIP does not then it is most likely due to the 
choice of audio codec.  Google voice is probably using something like 
g.729 or speex/opus whereas if you haven't made changes to a default SIP 
install you may be using G.711 or G.722, etc.

My experience has been that wifi on good APs with the appropriate codec 
is just barely ok for business users.  I think most people that are 
serious about it in a business environment are using DECT.

Kevin

On 10/11/2013 05:39 PM, Karl Schmidt wrote:
> On 10/11/2013 09:02 AM, Michael Jerris wrote:
>> Audio issues on wifi have nothing to do with the signaling protocol, they have everything to do
>> with the codecs and other media features.
>
> Not sure what you mean - it appears to mostly have to do with the nature of wifi - today's wifi only
> serves one client at a time - thus there are gaps that best case could be covered with large buffers
> and delay.  I did more tests just today with a Debian desk top and linphone as the client - works
> fine if the host is the only one connected. If you have a second host moving a data stream, it gets
> bad pretty fast.  The closer the AP and host the better it works as there is more bandwidth - but I
> could make things fail even at close range.
>
> What I'm looking at is the ability for skype and Google voice to work where SIP does not.  I have a
> lot more tests to run. I've bumped into this claim several times.
>
> ( I did find confounding problems if zrtp was turned on with a client without support - this is even
> on 1000BaseT not wifi related )
>
> I'm also reading that CISCO has APs that make SIP work better - might just be marketing hype - but
> could be careful sharing of bandwidth and QOS.
>
>
>> My biggest issue with wifi based sip phones is the
>> battery life sucks.
>
> Even when the phone is used as a phone it is a problem - wifi tends to burn even more power.  I've
> wanted to make it work with something in the 7" format that would have more battery. Newer chipsets
> can use a lot less power if the drivers are right.
>
>
> Don't bother w/ IAX2 its a solution looking for a problem.
>
> That is what I've heard - but I do see some products supporting it - makes me think there is a
> reason. ( my searches did not find happy freeswitch users using IAX2 )
>
>
> --------------------------------------------------------------------------------
> Karl Schmidt                                  EMail Karl at xtronics.com
> Transtronics, Inc.                              WEB http://secure.transtronics.com
> 3209 West 9th Street                             Ph (785) 841-3089
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>
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> threat of physical force, that we enter in deals that are not in our interest.
> kps
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