The list of codecs used for codec negotiation during call setup, is the subset of codecs supported by the device and those in the codec preference list, limited by the maximum audio bit rate for the region or region pair. Answer is D.
Cisco Collaboration System 12.x Solution Reference Network Designs SRND.
Chapter 6 Cisco Unified CM Trunks
It is very tricky. Service Parameters only determines whether CUCM allows negotiation for all, some, or no devices. However, negotiations are carried in regions and codec preference list. No obstant I consider answer is D.
The correct answer is D, and B can't be at all, because we don't have "in-service parameters", as in "service parameters" also you got options to enable or disable codec.
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