407 error,authentication required

I got a 407 response from carrier when sending a  request "Invite" with a sip endpoint which is registered through NN4500 to the sip server.

the carrier requires  my sip server to register to its softswitch,however,my sip server has no such  a function like registering to other softswith.

so ,What should i do  with NN4500? 

the carrier supply me with a account  8110,password 123456  

Carrier's softswitch ip addrress   xx.xx.xx.xx    port  xxxx

could you tell me what configure should i do to the nn4500?

thanks!