(keitai-l) voice in data out?

Hi,
 Are there any devices out there that supports conversion of voice to text
on the phone. 
I was wondering about the possibility of using Voice for data input but have
text/images as output and the looks like the possibilities are

1. The phone should be able to send voice to a "voice to text" converter on
a server and should be able to switch to data mode to receive data that the
server will send back. Doesn't seem like the phone can support voice and
data on the same connection..so this seems doubtful.

2. The phone supports "voice to text" on the device and there is
programmatic access to this feature. The connection remains data throughout.

3. The voice is send over a VoIP kind of mechanism to a "voice to text"
converter on the server, and the server sends back data in some other form.
(since the other end is not a human listener, i guess there can be
compromises on latency, delay etc.). Difference between this and the first
is that - here the connection remains a data connection throughout, where as
in the first case the request is a voice connection and the response is over
a data connection.

Are any of these possible? Any ideas/pointers to related work?

Thanks in advance.
Rgds/Samal.

[ Did you check the archives?   http://www.appelsiini.net/keitai-l/ ]