My environment includes a CME/CUBE, with all SIP traffic bound to loopback 0.
I'm posting the relevant configurations to hopefully save everyone a huge headache and a ton of time, if you choose Nextiva as a SIP trunk provider ITSP. So, after hours of analyzing packet captures, debugs, and working with TAC, I was able to get a working configuration between Cisco CME/CUBE and Nextiva. I was given my Username, Password, and the domain bt. They have no example configs or recommendations for Cisco CME/CUBE/VGRs connecting to Nextiva. They'll tell you to install a free soft phone and if your soft phone registers, they say they've proven their side is good and it's up to you to figure out your PBX configurations. Their Tier 4 support can basically only tell you if your connected to them or not. Once we signed up for Nextiva, I was less than impressed with the amount of support they offer to get customer's SIP trunks operational. After getting multiple quotes, it seemed like Nextiva was the best fit for this small office environment. I have a customer that wants to migrate from expensive analog FXS lines to a SIP Provider/ITSP.
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