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...
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 providers, therefore, view gateway-based solutions as an inadequate response to the FMC opportunity. They are turning instead to server-based technology, a more generalized approach that spans all types of networks: fixed and mobile, IP and TDM, business and residential. > > > > Pretty interesting stuff. > > > > -- > > Jason Parker > > Digium > > > > _______________________________________________ > > > > 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 > > > > _______________________________________________ > > 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 _______________________________________________ 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
