This week I've implemented a SIP-trunk at a customer site. This trunk is connected to a Cisco UC540. I could use almost all settings which I used in my lab setup. Before configuring the trunk I wasn't sure if the line setup would work with the CUE (VM-module) embedded in the UC540.
The customer has a simple IP-VPN connection with Routit, this means Routit supports a single IP-sgement with a maximum of 255 hosts and no routing of other customer IP-segments. I wasn't to sure if this was enough or if I had to use NAT because the embeded CUE lives on a different IP-segment. This UC500 was manually configured instead of with CCA. This meant some commands which CCA injects were missing. The following commands made the CUE work with the SIP-trunk without NAT:
