VoIP call transfer?

Paul McMillan Paul at SemiCubic.com
Wed Mar 28 22:27:39 CEST 2007

Apologies if this arrives twice...

For starters, a friendly reminder that it's spelled "sense".

That said, the way to do this is not with skype, but with Asterisk. If you
route ALL your incoming calls through an asterisk box (whether hosted by
you, or by a service provider) it should be possible to manage completely
seamless transitions. It would look something like this:

Your contact calls your phone number (a voip DID number)
the call is routed to your asterisk box
your asterisk box checks to see if you're in a WiFi area
You are presented with the call, with the option to take it via wifi or gsm
If you take it via wifi, your asterisk box routes the call via SIP or IAX
directly to your phone.
If you take it via GSM, your asterisk box calls the PSTN and routes the call
through itself to the phone via the regular cell network
When you transition zones (going to wifi from gsm, or the other way around),
the asterisk box establishes a call via the other protocol, bridges the
voice, then once your neo device has fully transitioned itself over to the
new medium, it disconnects the previous call.

So your contact never has direct access to your cell number. Instead, they
call your voip number which is routed as is convenient for you. When you
transition zones, the most trouble you will have is perhaps a slightly click
or momentary dead air as the device transitions over. If you accidentally
wander out of range of your wifi, the asterisk box will notice this and
automatically call you via gsm, which the phone will pick up automatically.
This won't be as seamless, but it won't result in a completely lost call.
It's also worth noting that this system can be functional for outgoing calls
as well, so long as you route all calls via your asterisk box. This has the
side effect of making international calls via from your cell cheap and easy.


p.s. Ignore the guy who has no imagination... most things are possible with
a little thought.

On 3/28/07, mathew davis <someoneinjapan at gmail.com> wrote:
> I have an itch that I would like to explain to you and give an idea of how
> to overcome that itch and see if that is possible or not, and if so a good
> idea or not.  So first here is my itch.  I have a VoIP phone at home which
> uses my WiFi connection to make calls using skype.  I like that it helps
> lower my cell phone bills a lot since I started a new business and it takes
> a lot of calls to make it sucessful.  But I am not always at home sometimes
> I am just 5 minutes out from home and recieve a phone call I talk on the way
> home and then to cut my minutes short I tell them I will call them right
> back and then hang up switch to my VoIP phone.  That gets old sometimes.
> Granted it is not a very big itch but it is annoying.
> So I have come up with several solutions.  First, with the neo I could get
> a plan that includes data with my minutes and I could use skype or some
> other VoIP solution like astrisk.  Which in turn would be great.  Oh also
> another question can you get a data only plan?  Just curious I know some
> people may or may not have mentioned it but the thread that it was mentioned
> in has over 80 e-mails and couldn't find it right off.  But let's pretend
> that for somereason you didn't want to add a data plan to your mobile device
> because it was too expensive or what ever.  Would it be possible for the neo
> to know when you step into range of a WiFi network that you have acess to?
> And after it notices the WiFi connection it pops up a button on the screen
> that say's transfer to VoIP?  You say hold on a sec and press the button.
> The neo then puts the user on hold and transfers the call to your VoIP line
> on your neo where you pick it up, or the neo picks it up.  The voice line
> then hangs up the call and puts the person back on the line with you.  Does
> that make since?  Also when making a call and I am in range of a WiFi
> network a check box or a seperate call with VoIP button appears that allows
> you to place the same call over the VoIP?  Does that make since?  Just
> wanting to get everyones opinions on this.
> This is a feature that I would like very much.  I have internet at home
> which has a 15Mbps transfer rate with a 1000GB cap so I should be free and
> clear with this.  I would love to have this feature.  I would like to learn
> how to do this on the neo but would definatly need more time to research it
> out.  Plus I would need more time to work on it, maybe when I graduate
> school.  I would also need someone to help me.  Any ways I am starting to
> ramble so please let me know what you think about this?
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