Span port for VoIP

Note this only a switch technology
Port the IP Phone is plug into
switch#configure terminal
switch(config)#
switch(config)#monitor session 1 source interface G0/1 both

Port the Laptop with wiresharp plug into
switch(config)#monitor session 1 destination interface G0/10

check by
switch#show monitor session 1

Wireshark

The second byte in the IPv4 header is used for Differentiated Services, or DiffServ (Used to called: Type of Service[ToS]).
It’s split into two parts:
6 most significant bits define the DSCP (differentiated services code point)
2 least significant bits are for ECN (explicit congestion notification).
DSCP ECN
000000 00

Wireshark QoS DiffServ

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About Alexis Katsavras

Working as Freelance Cisco Unified Communications Consultant in the UK. www.NetPacket.co.uk