> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:asterisk-users- > [EMAIL PROTECTED] 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 <[EMAIL PROTECTED]> wrote: > > > > > > Snip headers > > > On 9/20/07, Jason Parker <[EMAIL PROTECTED]> 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 "[EMAIL PROTECTED]" 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: > > > > "[EMAIL PROTECTED] 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/ _______________________________________________ Sign up now for AstriCon 2007! September 25-28th. http://www.astricon.net/ --Bandwidth and Colocation Provided by http://www.api-digital.com-- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users