[asterisk-users] OT: Samsung Sprint CDMAoIP

[Dovid B]

CF,
I think the best idea is to wait till it comes out and run etheral. This 
would be great for when I travel out of the US. (Yes I can use my network) 
but why not use some else's ant not pay ;) Also I wonder if Hotel's out of 
the US will start putting these up for their guests.

----- Original Message ----- 
From: "C F" <shmaltz at gmail.com>
To: "Asterisk Users Mailing List - Non-Commercial Discussion" 
<asterisk-users at lists.digium.com>
Sent: Friday, September 21, 2007 8:10 PM
Subject: Re: [asterisk-users] OT: Samsung Sprint CDMAoIP


> Does that imply that sip is not VOIP since it can be used for video?
>
> On 9/21/07, Eric Chamberlain <eric at voxilla.com> wrote:
>>
>> > -----Original Message-----
>> > From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-
>> > bounces at lists.digium.com] On Behalf Of C F
>> > Sent: Friday, September 21, 2007 7:34 AM
>> > To: Asterisk Users Mailing List - Non-Commercial Discussion
>> > Subject: Re: [asterisk-users] OT: Samsung Sprint CDMAoIP
>> >
>> > On 9/21/07, Alexander Lopez <Alex.Lopez at opsys.com> wrote:
>> > >
>> > >
>> > > Snip headers
>> > > > On 9/20/07, Jason Parker <jparker at digium.com> wrote:
>> > > > > C F wrote:
>> > > > > > AFAIK, the calls are free when you use it thru that device. 
>> > > > > > Sprint
>> > > > > > however charges $15 a month per phone or $30 for family plan.
>> > > While I
>> > > > > > agree that sprint should pay me for this, it's not as bad.
>> > > T-mobile on
>> > > > > > the other hand, does the same thing with wifi enabled phones, 
>> > > > > > it
>> > > > > > doesn't cost extra, and is completely free.
>> > > > > >
>> > > > >
>> > > > > If you're referring to T-Mobile's "HotSpot at Home" service, it's
>> > > actually
>> > > > $20
>> > > > > per month, per line on the account (unless it's changed very
>> > > recently).
>> > > > >
>> > > >
>> > > > I don't know about that, could be you are right.
>> > > >
>> > > > > As far as how it works on T-Mobile, I recently had some questions
>> > > > answered by
>> > > > > them about that..  They use UMA over wifi, and it does automatic
>> > > > switching
>> > > > > between the wifi and the gsm towers (ie; your call stays up).
>> > > >
>> > > > The same goes for Sprint.
>> > > >
>> > > > >
>> > > > > Quote from the tech I talked to:
>> > > > > "HotSpot at Home does not use a VoIP protocol, as the voice data is
>> > > > > transferred from the Internet directly to our UMA Gateway and 
>> > > > > then
>> > > > > through our regular Mobile Switching Centers."
>> > > >
>> > > > I know it's a quote from the tech, but isn't it voice packets that
>> > > > travels over the Internet (a packet switched network) instead of 
>> > > > over
>> > > > GSM (TDM switched network) which makes that statement incorrect? It
>> > > > doesn't matter what the higher level protocol is, it's still VoIP.
>> > > >
>> > > Your right it is "STILL VoIP" by definition but its not...
>> >
>> > Yes it is, not only in definition but in practice as well. See below.
>> >
>> > >
>> > > From: http://www.newstep.com/our%20market/technologies.asp
>> > >
>> > >  Gateway-based Solutions
>> > > By placing special gateways at the edge of a GSM network, Unlicensed
>> > > Mobile Access (UMA) allows users with dual-mode handsets to access
>> > > mobile phone services via both cellular and Wi-Fi links. In cellular
>> > > mode, voice traffic travels over standard GSM radio waves. In Wi-Fi
>> > > mode, an IP tunnel carries GSM traffic across the enterprise network
>> > > and/or the Internet to a UMA gateway. The gateway looks like a base
>> > > station controller (BSC) to the cellular network, so when a handset
>> > > moves between cellular and Wi-Fi coverage, the network handles it as 
>> > > an
>> > > ordinary BSC-to-BSC handoff. MSC emulation-also known as IP VLR-is
>> > > similar to UMA, except that the gateway mimics a mobile switching 
>> > > center
>> > > (MSC) and a visitor location register (VLR) instead of a BSC.
>> > >
>> > > Intimately tied to cellular technology and dual-mode handsets,
>> > > gateway-based solutions provide access only to mobile network 
>> > > services
>> > > and can be deployed only by facilities-based mobile network 
>> > > operators.
>> > > Moreover, gateway-based solutions cannot leverage the full 
>> > > capabilities
>> > > of IP and VoIP because all voice traffic remains in TDM format. 
>> > > Service
>> >
>> > When the above line is taken out of context (which is what I
>> > understood from your response) then it could be said that it suggests
>> > it's not VoIP. But really all the paper is saying is that to the
>> > network (GSM) it doesn't look like VoIP but like TDM, since it's in
>> > that format, and can therefore not take advantage of most VoIP
>> > features. But it's still VoIP.
>> >
>>
>> It's GSM tunneled over IP, some of the data traffic may or may not be 
>> voice
>> traffic in the GSM traffic in the IP tunnel.  Calling it VoIP would be a
>> stretch.
>>
>> --
>> Eric Chamberlain, CISSP
>> Chief Technical Officer
>> Voxilla - http://voxilla.com/
>>
>>
>>
>>
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