I have free long distance from my home phone.  My cell phone has
unlimited local calling and I'm trying to set it up so  that I can
somehow call my home phone from my cell phone and be able to make
calls from my home line (thereby getting free long distance from my
cell).  I've looked for voice modem telephony software that might have
some sort of call routing/switching functions but couldn't find any.

If you don't already have free long distance on your cell, you should
look for another carrier.

See if you have a call forwarding feature on your home phone.  This
may cost additional money.  A downside would be you could only call
one number (one that you pre-program while you're at home).

Solution 2 (and this would take a lot of legwork)...find a way to get
a script for your modem to:

1. accept call a call
2. read in a phone number that you type from your cell phone
3. hang up
4. set up call forwarding to that number
5. do not accept the following call (since it'll be you trying to make
the long distance call

You would need a few things:
1) call forwarding on your home line
2) email program that has a incoming email rules wizard (Microsoft
Outlook 2002 or newer)
3) ability to send email from your phone

It would go like this:
1) Send an email to an account that you have set up with the word
"FORWARD" in the subject line and the phone number you want to dial in
the description field
2) The email program would detect the new mail (checking every few
seconds) and then run launch a VB script passing the parameters to the
vb script
3) The modem would pick up the line and dial the *72,SUBJECTLINEHERE
4) Then you call your home phone number and it would automatically
forward to the long distance number
5) Send an email to an account that you have set up with the word
"CANCEL" in the subject line
6) The modem would pick up the line and dial the *72,SUBJECTLINEHERE

You would need some basic VBScript programming knowledge but this
wouldn't be too hard to do.  Even a simple standalone program could do
this.

If you have to go through all of that to save money you are using the
wrong carriers. Take a look at www.utilityopt.citymax.com and email me
if you want to try SIMPLE instead of COMPLICATED. If you are paying
anything more than FREE for long distance, you are paying too much!

citimax sucks, as do all spammers.