We ended up using Twilio instead of SIPstation because SIPStation required a minimum of 1 trunk at $25 per month plus the $1 each or whatever for the individual DIDs. Twilio does not have the trunk fee for elastic SIP trunking. The DID costs look to be about the same as do the per minute cost.
Our setup is described in this thread:
We did stay with Vultr https://www.vultr.com on their $10 plan to start and so far with 3 DIDs and our initial call volume it is performing very well.
Our DIDs are SMS enabled and we struggled with that. We were trying to get the SMS messages to the PBX and then to a extension or user. Maybe we did this wrong, maybe we needed a commercial module. In any case, we decided that we didn’t really need to send text messages right now from the main business DIDs. The only reason we would probably ever receive a SMS to the main DIDs was for new customers. So to accommodate this we setup a Twilio Flow that handles this nicely. Any incoming SMS messages are automatically responded to with a message saying that we do not accept SMS on the main business numbers and included a link to call instead. This way people are not wondering if their message was ignored on not delivered.