I was asked to integrate a CUBE gateway with a UK Service Provider using SIP. Considering a CUBE SIP integration was a task I had performed many times with service providers in the US, I thought it would be a walk in the park. Unfortunately, I was mistaken.
I knew from my previous integrations in the US that Cisco publishes their supported configurations for service providers, however this is not the case in the UK as you can see by clicking here.
When I first had a look at the configuration I noticed there were several commands missing like the realm and the UDP port ranges. Without this crucial information, configuration would have been impossible. After an hour I was able to attain the information I needed. This was a simple task but became quite time consuming and therefore I’m posting this article to help anyone else, should they run into this issue.
I did manage to get everything resolved in the end and below is the workable configuration that you need to use to register a sip trunk to a service provider in the UK.
Note this is registering the CUBE Public IP address to the Service Provider SIP Network.