Which fault domain should be investigated first?

exams 210-060 210-060 exam 0 Comments

A single end user reports that the message waiting indicator lamp on his 7945 IP phone does not light when messages arrive or upon incoming calls.

Which fault domain should be investigated first?
A . network routers and switches
B . Cisco Unified Communications Manager Media Resources
C . IP phone
D . voice gateways

Answer: C