Tried many different settings in SIP, but just cannot connect. No problems whatsovever using X-Lite.

Here are the settings I use in X-Lite, please tell me what I should enter in the voicent fields.

USER DETAILS
Display Name: {my name}
User Name: 2210000
Password: {my password}
Authorisation User Name: 2210000
Domain: lon-pbx-5.gradwell.net

DOMAIN PROXY
Register with domain and recieve incoming calls (ticked)
Send Outbound via: Proxy (ticked) Address: natproxy.gradwell.net:5082

If your computer is behind a firewall, you must specify a STUN server.

I have tried entering this (stun.gradwell.net – port 3478), however it does not work

Please use the following for setting up Voicent SIP:

STUN Server: stun.gradwell.net

SIP ID: sip:2210000@lon-pbx-5.gradwell.net
SIP Proxy: natproxy.gradwell.net
User: 2210000
Password: {your password}
Realm: asterisk