I was curious to see how much this might cost...
Maybe the HT9032C for $2 [1]
* application note [2]
* miscellaneous info [3]
* something similar [4]

[1] http://www.aliexpress.com/cheap/cheap-ic-ht9032c/2.html
[2] http://www.holtek.com/pdf/comm/9032v141.pdf
[3] http://www.microchip.com/forums/m22769.aspx
[4] https://bigdanzblog.wordpress.com/2015/05/22/testing-linksprite-caller-id-module-based-on-ht9032-with-a-pc/

cheers -ben

On Mon, Jun 15, 2015 at 9:43 PM, Louis LaBrunda
<Lou at keystone-software.com> wrote:
> Hey Tim,
>
> I will try to keep you informed.  The board you pointed me to seems like
> overkill and at any rate is way more expensive than I can use as I would
> like to build something and eventually sell it.

> Someone from element14, the company here in the US where we can buy
> Raspberries, said "No chip is needed, but you need to program the GPIO to
> listen to a ring and then FSK the remaining information from a bleep.
> http://electronics.howstuffworks.com/question409.htm".  This seems like a
> tremendous amount of work to get the GPIO to do and a lot of reinventing
> the wheel.  I don't know for sure but I think there should be a chip that
> can get the caller id info and pass it to the Raspberry (USB or other port)
> and maybe even be able to handle the A/D-D/A conversion for recording and
> playing of messages.
>
> I'm trying to find a chip(s) that can do this and then maybe some help
> wiring it to the Raspberry.
>
> Thanks for your interest and any other thoughts you may have.
>
> Lou
>
> P.S.  I need permission to enter the site you pointed me to below.
>
> On Sat, 13 Jun 2015 10:20:43 -0700, tim Rowledge <tim at rowledge.org> wrote:
>
>>
>>On 12-06-2015, at 11:11 AM, Louis LaBrunda <Lou at Keystone-Software.com> wrote:
>>
>>> Hi Tim,
>>>
>>> Thanks a lot for the information.  I will look into it.
>>
>>Do please report back on what you find. I have a very-back-burner project I’d love to do something with one day with which I’d like to make iPhones etc talk to a PI running asterisk and then to POTS so that one can answer and make calls via the house landline.
>>
>>Very old and rusty website - https://sites.google.com/site/tcjspp/?pli=1 - resulting from a rather fun Coursera course I took.
>>
>>tim
> -----------------------------------------------------------
> Louis LaBrunda
> Keystone Software Corp.
> SkypeMe callto://PhotonDemon
> mailto:Lou at Keystone-Software.com http://www.Keystone-Software.com
>
>