What is COTS? Refers to low-cost servers that are commonly available, plug-and-play appliances for running any virtualized software. Commercial-off-the-shelf (COTS) software and services are built and delivered usually from a third party vendor. COTS can be purchased, leased or even licensed to the general public. COTS can be obtained and operated at a lower cost over in-house development, and provide increased reliability and quality over custom-built software. Commonly used in Mavenir's 4G and 5G Solutions.