Can you post your SIP config up please, and just remember to remove any sensative information from it.
Oh and i forgot to mention, if you can please add some debugs there might be some information in there to help out as well.
Message was edited by: David Trad
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I think you are using the wrong ip address- you are supposed to set up sip link with the host trunk.2talk.co.nz which is 126.96.36.199 not 166. Give it a go and see what happens, my config worked (almost) straight away. Don't forget to enable sip trunk forwarding on the 2talk setup page (i am assuming you have public IP for the UC520). If it gives you more grief, I'd doublecheck firewall ACLs
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