Having an other SIP client (eyebeam) working simultaneously with your Nokia may or may not be the source of the problem. You can assess that by turning off your eyebeam. If the issue persists while the phone is the lone SIP client in your LAN you'll know it's strictly your phone or your phone's inability to properly communicate with Voxalot's servers because of the NAT. As part of your troubleshooting actions, you could assign your E71 static IP and place it on DMZ from your DSL router. The other viable option is to seek better equipped SIP client for your phone which will have better chances to work under the circumstances. Personally, I think acquiring and supporting PBX for the lone purpose of having your Nokia phone working doesn't seem justified, but it's your time and money, plus it's not like you won't have your hands full if you haven't messed with PBX server before.
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