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You are not supposed to see the voice traffic. What you actually plugin to on the IP phone is a three port switch, one uplink port to the Cisco switch, one port internal for the IP phone and one for the PC. So the voice traffic directed to the IP phone comes into the uplink port and then stays in the IP phone through the internal port. The other traffic (for your PC) goes out the second external port. When you want to see the voice traffic you need to capture on the uplink port. This usually means inserting another capture switch between the uplink port and the Cisco switch port, or a span port on the Cisco switch.