Which pre-implementation step was omitted?

After an Avaya Aura® Communication Manager (CM) upgrade, a customer called Avaya support because their SIP telephones were unable to login. Support was able to confirm that the telephones had not been upgraded.

Which pre-implementation step was omitted?
A . Provide accurate licensing specification.
B . Verify version installed is compatible with existing versions.
C . Test all third-party equipment and software.
D . Access support.avaya.com to verify customer systems compatibility.

Answer: B

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