I am trying to get some recommendations for vendors in the St. Louis area that can upgrade software for an IP office system. Currently we have analog trunks and would like to migrate to SIP trunks but cannot purchase the licenses since our software versions are no longer supported. I have looked at the avaya retailer listing but have no idea who may be the best in the St. Louis area to start the conversation and I'd rather not just pick from the listing. Thought I would ask and see if anyone was familiar with the area and recommend some that are good to work with, thanks.