Do anyone know about any VOIP applications for symbian (I have an N95) that can run in ad hoc mode?

What I want to do is, put my N95 in ad hoc mode, and open a voice connection to an other N95.
There lots of VOIP applications out there, some very good, but they all rely on external SIP gateways, or other similiar propritary solutions. I don't need that, since it is two phones on a single ad hoc connection.

I have been looking around for this awhile now, without success. There are a few applications that support this for Windows Mobile/Ce etc, but hey, who uses that?

It shouldn't be too hard to do this in J2me, but I am hesitant to allocate time for this if the wheel is already invented.

Any ideas or references?