It appears that Nokia has reversed their decision to offer NAT traversal on E-series devices. The FAQ for the E60, E61, and E70 have all been changes to say that the phones do NOT support NAT traversal. The statements regarding the addition of STUN, TURN, and ICE have been removed. This is odd as the version 3 firmware for the E61 did add STUN support but it would appear that Nokia is no longer going to support this feature. See the following post at my-symbian.com for more info:
http://my-symbian.com/forum/viewtopic.php?t=30318&postdays=0&postorder=asc&start=10
Mark