Just found this whilst googling about for VOIP for the E61.
http://www.nokme.com/call-skype-with-your-nokia-e61-and-even-more-6.html
Maybe it's of info to someone.
**Edit Just read through the bits and bobs thoroughle. It sets up a conference call system so it does eat up you minutes / credit. Sorry for duff info.**
Psi