Williams Trinity Group Offers multiple Premise based Voice over IP Platforms. Premise based platforms are appropriate for single site installations, or organizations that have a routed WAN. Typically premise based systems have a higher capital startup cost as more equipment is needed at the time of installation. However, their operational costs month over month are much lower. Please contact us at email@example.com 918-928-9840 for assistance with your needs. We are proud to offer the following solutions to our clients.