Not able to register SIP trunk

My sip provider has given me -

  1. Username
  2. Password
  3. Domain
  4. Proxy Address
  5. Authname

Suggest register string.

You have to check the responses for your REGISTER requests. In CLI

sip set debug on
set set debug PROVIDER-IP

If there are no responses, check your firewalls and the firewall of your SIP provider.
If there are, they should contain a reason why REGISTER fails.