Which license is required for a user to use the Avaya Communicator softphone?

The Avaya Communicator softphone requires the "Power User" license (Option B), which includes advanced mobility and softphone functionality. Option A (Office Worker) supports one-X Portal but not full softphone features, Option C (Teleworker) is for remote deskphones, and Option D (Basic User) lacks softphone support.References: Avaya IP Office Licensing Guide.