You are planning to provide voicemail and auto attendant at your site. What guideline can you follow to allocate service resources?

A.
Divide available voice ports equally between voicemail and autoattendant

B.
Accept the default setting for voice port allocation

C.
Allow 1 plus half of the total available ports for each

D.
Allow 1/3 of the voice ports for autoattendant and 2/3 for voicemail