What carries voice VLAN to a Cisco phone? 05/27/2018 – by Mod_GuideK 0 A question-about what carries voice VLAN to a Cisco phone? A. SIP B. LLDP C. CDP D. SKINNY E. RSPAN SHOW ANSWERSCorrect Answer: C Explanation/Reference: You must enable CDP on the switch port connected to the Cisco IP Phone to send the configuration to the phone (which includes the Voice VLAN to be used).