Help Working SIP client on the Moment?

[Ezzelin]

As the theard title states, I'm lookong for a working SIP client for the Samsung Moment. I've tried Sipdroid, Guava, Sipagent, and Fring. All seem to have issues. For that matter, Sipdroid is the only one that comes close to working, and while calls connect, the other end cannot her me. All of the other apps don't have any audio or crash. I've verified that my setup works on my PC using the Gizmo5 client (I'm using G5 + Google Voice with callback) Has anyone else made SIP work on their Moment, and how?