The Mitel 9115-500-000-NA Superset 420 is a business phone set designed by the brand Mitel. This model belongs to the Mitel Superset series, known for its advanced features and performance in a professional office setting. With the Mitel Superset 420, businesses can expect a reliable and high-quality communication solution for their call management and productivity needs. This phone set is a top choice for business professionals looking for a dependable and feature-rich phone system.