A customer recently upgrading their UC environment from Avaya one-X® Portal 5.2 Avaya one-X® CES 6.1. All of the users will continue to use their Avaya Desktop (SIP) telephones along with their…

A customer recently upgrading their UC environment from Avaya one-X® Portal 5.2 Avaya one-X® CES 6.1. All of the users will continue to use their Avaya Desktop (SIP) telephones along with their Avaya one-X® Communicator and Mobile clients. However, several of these desktop telephones (9620s, 9630s, 9640s) are on various software releases. What is the minimum software release that supports these Avaya SIP Deskphones when integrated with the Avaya one-X® CES?