asterisk users - Mar 2005 - best protocol/codec for dialup

What would be a good combination to use on dialup connections?  I know
iax is better than SIP, but I dont' know much of anything about the
various codecs.  Also, how well would an iax or sip solution work
compared to skype as far as voice quality?

If it helps, here is what I'm trying to do.  We know about 30
different families in one area in Russia that have relatives here in
the US.   What I want to do is put in an * server with a couple of
pstn lines in Russia so that all of them have the ability to call the
US by making a local call.    Most of the time these familes can't
afford to call their relatives in the US, and internet access is
fairly expensive as well, although some of them do have it.

Chris

> What would be a good combination to use on dialup connections?  I know
> iax is better than SIP, but I dont' know much of anything about the
> various codecs.  Also, how well would an iax or sip solution work
> compared to skype as far as voice quality?
I have a relative that is on dialup and calling me using MediaX set
with gsm. Works great.

I'm laughing at the fact that he use the phone line to connect to the
internet to then take a softphone to call me :)

But hey, that way Bell Canada doesn't make a dime.

For the sound quality, I (and he) would say that it sound better then
a call thru the PSTN.
And this is a call from Vancouver to Montreal

hth