hello paul,
even iam doing the same thing
i think we are on the same boat
take look at voip-info.org
i think it will give the whole
information
any way give your personal id
i want to ask some questions
1) are u professionally in r&d
or a hobby
2) if you are in to serious busines
of r&d
what sort of work your doing
what have you done till now
i want help i will help with my knowledge
so keep in touch
rama kanth