Should allow user to select between GVCallback and normal phone dial out

[GoogleCodeExporter]

[What steps will reproduce the problem?]
This is not a problem -- it's a feature request.

[What is the expected output? What do you see instead?]
Current functionality is that when enabled, GVCallback intercepts every
call, and initiates a callback from GV. If you're in an area where you have
poor data service, you have to manually open the app and disable its
functionality before you can place a call.

Instead, the app should function like the official Google Voice app -- when
you place a call, it prompts whether you would like to use Google Voice or
not, and then places the call. Also, you can select which of the two
actions (normal call, GV dialthru) you'd like to use.

I propose that GVCallback should work in the same way -- when you place a
call, you should be prompted to either place a normal call, or initiate a
GVCallback. Alternatively, at least just add an option so that we can leave
the GVCallback "call interception" disabled, but be able to select
GVCallback as an action for anyone in our contact list.

[What version of the product are you using? On what operating system?]
I'm running GVCallback v0.2 (latest released) on Android 2.01 (on a
Motorola Droid).

[Please provide any additional information below.]
Even as it is, this is a very useful app. The only problem I have is with
the idea that GVCallback should always intercept calls -- I would rather
make that choice myself.

Thanks for your hard work!

Original issue reported on code.google.com by pcmst...@gmail.com on 22 Feb 2010 at 4:55

[GoogleCodeExporter]

I'd love it if a check could be added so if someone belongs to a specific 
contact
group, it goes out via GV.  If not, goes via the normal dialer.

Original comment by goali...@gmail.com on 29 Apr 2010 at 2:42

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I'm commenting mainly to support the "GV dialthru" feature.

In my case, I'm on prepaid without data and I use Sipdroid/Gizmo5 with GV over 
wi-fi
to save minutes. I also use Airplane Mode Wi-Fi Tool to toggle the cellular 
radio
depending on wi-fi connectivity.

Before Evan Charlton's GV app was removed from Market, I was using a 
combination of
Google Voice Callback (from Market, not this one) with Evan's GV. The former for
outgoing calls over wi-fi/SIP which uses the callback method and the latter for
outgoing calls over the cell network using the dialout method. I always make 
calls
through GV, with the only exception being the possibility of a 911 call which I
obviously only want going through the cell network.

With the setup I was using, I didn't need to think about which was being used, 
since
Google Voice Callback had an option to only work when there is an internet
connection, which would override Evan's GV 'all calls' option. Now with GV being
removed, my setup is broken. Fortunately I almost never need to make outgoing 
calls
over prepaid, but it's still nice to have that option available.

For me the official GV app is really only useful for SMS and voicemail since 
making
calls through it requires both data and cell connectivity simultaneously, but I 
only
have one at a time.

Original comment by pilota51 on 19 May 2010 at 7:11

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I'd love callback to intercept based on a regular expression like sipdroid 
does.  IE, if number dialed starts with +1 
(^\+1.*) then use callback.  That way I use GV to make free calls to the US and 
Canada etc, and free calls locally 
using my local sip provider.

Original comment by kro...@gmail.com on 27 May 2010 at 9:41