Presence and IntComm WG

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> -----Original Message-----
> From: ext Ben Teitelbaum 
> [mailto:]
>  
> Sent: Friday, February 17, 2006 2:38 PM
> To: 
> 
> Cc: Pradip Patel; Tom Kershaw
> Subject: Re: [wg-pic] EQO and Skype partnership lets you run 
> Skype on cell phone
> 
> 
> Interesting.  Is the notion to support the kind of automatic 
> WiFi-cellular roaming that VeriSign can do?  VeriSign's stuff 
> seemed very cool, but there was a real lack of good dual-mode 
> handsets 6-12 months ago when I was looking at it.  With 
> Nokia building dual-mode handsets, perhaps that's changed!
> 
> On a related note, what's the deal with UMA [1]?  It seems to 
> simply tunnel GSM/GPRS over IP over WiFi, essentially 
> treating a WiFi AP like a free tower (from the carrier's 
> perspective).  Could an app running on a UMA handset like 
> Nokia's 6136, turn UMA off and implement P2P SIP or is access 
> to the 802.11 radio on these handsets locked down?
> 

Nokia has announced two kinds of dual mode phones.  The E-series phones
integrate with your own SIP registrar.  I believe that with this
configuration, calls would come into the SIP registrar and either get
redirected to the mobile phone number to use the cellular network or to
the SIPUA on the phone if it is registered.  Maybe it is just that SIP
calls can be used whenever the Wifi is active.  This is aimed at
enterprise users who are going to run their own VOIP systems.

The other set of phones are UMA-enabled, which as you say is the
equivalent of a free set of towers.  Certainly the Symbian S60 phones in
this category could be used with a SIPUA in the same way as the E-series
phones.  I do not know if it is possible to use the SIP user agent that
ships with the phones in this mode or if that will be locked down in UMA
mode.

The 6136 is S40, so the only kind of applications that can be installed
are Java CLDC 1.1 MIDP 2.0.  I do not know if that is enough to do SIP.
There are some S60 smartphones coming such as the N80 that can run
Symbian C++ apps as well as Java, so it should be possible to install a
more generic SIPUA.

Jamey