A helpdesk manager at a financial company has received multiple reports from employees and
customers that their phone calls sound metallic on the voice system. The helpdesk has been using
VoIP lines encrypted from the handset to the PBX for several years. Which of the following should
be done to address this issue for the future?

A.
SIP session tagging and QoS

B.
A dedicated VLAN

C.
Lower encryption setting

D.
Traffic shaping