Which three can be configured via the CallManager Service Parameters? (Choose three)

A.
Services URL

B.
Default MoH source

C.
Message waiting on/off numbers

D.
The preferred packet size for G.711 packets

Explanation:
Cisco CallManager Administration Guide, Release 3.0(1) Understanding Service Parameters

http://www.cisco.com/en/US/partner/products/sw/voicesw/ps556/products_administration_guide_chapter09186 a