Hi Thomas,
Unless you have a *very* specific need to use G.723.1 for compatibility with someone else, forget it. It is pretty much an obsolete product. Licencing is also a pain, as there is not patent pool for it. G.729 is expensive to licence, but at least it is relatively strightforward. If you think you will save some bits using G.723.1 instead of G.729, think again. The saving is minute, because of the huge overheads IP imposes.
Regards, Steve
I was measuring about 32-36 Kbit/s for a G.729 call, and around 20-22Kbit/s for G.723.
This is at the DSL router, so it includes all of the overhead.
If you're on a dialup modem, that can make or break the call.
-Andrew
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