[asterisk-users] Hardphone SIP phone costs

[Olivier]

2008/3/21, Darrick Hartman (lists) <dhartman at djhsolutions.com>:
>
>
>
> John Faubion wrote:
> >> are plenty of phones on the market which do SIP now - most
> >> modern Nokias do. I use an E90 Communicator, but the E95 is
> >> popular too, so I'm experimenting with using my mobile as my
> >> "one" phone, via Wi-Fi/SIP when I'm in the home/office and
> >
> > Out of curiosity, how do these phones handle the transition from Wi-Fi
> to
> > GSM? Is it seamless? Can the transition occur when on a call?
>
>
> Not seamless unless the cell phone provider offers such a service.


If you're on  call using GSM band, it is seamless.

If you're on call using SIP/WiFi, it's up to SIP server to dial a new call
to your mobile number and blind transfert previous call to it.
Maybe some dual band phones are able to automatically accept some incoming
GSM calls, put them in 3-way conference (of some kind) and wait for SIP
server to end WiFi call without asking anything to user.
Parts of this puzzle are here but integration should be rather hard.

  You
> won't find that available in the US.  So even though it's one phone,
> you'd have 2 numbers.  Cell phone providers have no incentive to offer
> such a hand-off because they wouldn't make any money on the calls after
> they are handed over to the voip system.
>
> Darrick
>
> --
> Darrick Hartman
> DJH Solutions, LLC
> http://www.djhsolutions.com
> http://www.djhsolutions.com/wiki
>
>
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