I didn't understand the E71 is crippled from configuration stand point, meaning pinpointing the root of the problem can be difficult at best.
In my opinion you can:
1. Consider installing an other softhpone client on your Nokia, one that supports better configuration and optimization.
2. I understand there's a .SIS package available for the E71 which provides additional features to the native SIP client, this might help. Google for more help.
3. Since your Nokia is using the 5060 port, change your eyebeam port to 5062 for example just in case.
4. Do you have web access to your DSL router? If yes, log in and place your Nokia on DMZ, this will forward all ports to your phone, then do some testing and see how it reacts, at least you'll know the problem comes from NAT-ing of your router and not the phone itself.
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