Vlan tags for voice

Hi all, can anyone tell me why we untag the vlan for data, but tag for voice when using the same port, does the untagged vlan have to be the same between all trunk ports ?, and also if it is untagged, how does the next switch know what vlan the data has come from ?

Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
Yes, for egress.  Ingress is "it depends".
You could also consider using both links for both kinds of traffic.

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    Disclaimer
    The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
    Liability Disclaimer
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    TechNet Community Support

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    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e7
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e8
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e9
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e10
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e11
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e12
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e13
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e14
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e15
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e16
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e17
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e18
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e19
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e20
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e21
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e22
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e23
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e24
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet g1
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet g2
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet g3
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet g4
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e1
    lldp med notifications topology-change enable
    exit
    interface ethernet e2
    lldp med notifications topology-change enable
    exit
    interface ethernet e3
    lldp med notifications topology-change enable
    exit
    interface ethernet e4
    lldp med notifications topology-change enable
    exit
    interface ethernet e5
    lldp med notifications topology-change enable
    exit
    interface ethernet e6
    lldp med notifications topology-change enable
    exit
    interface ethernet e7
    lldp med notifications topology-change enable
    exit
    interface ethernet e8
    lldp med notifications topology-change enable
    exit
    interface ethernet e9
    lldp med notifications topology-change enable
    exit
    interface ethernet e10
    lldp med notifications topology-change enable
    exit
    interface ethernet e11
    lldp med notifications topology-change enable
    exit
    interface ethernet e12
    lldp med notifications topology-change enable
    exit
    interface ethernet e13
    lldp med notifications topology-change enable
    exit
    interface ethernet e14
    lldp med notifications topology-change enable
    exit
    interface ethernet e15
    lldp med notifications topology-change enable
    exit
    interface ethernet e16
    lldp med notifications topology-change enable
    exit
    interface ethernet e17
    lldp med notifications topology-change enable
    exit
    interface ethernet e18
    lldp med notifications topology-change enable
    exit
    interface ethernet e19
    lldp med notifications topology-change enable
    exit
    interface ethernet e20
    lldp med notifications topology-change enable
    exit
    interface ethernet e21
    lldp med notifications topology-change enable
    exit
    interface ethernet e22
    lldp med notifications topology-change enable
    exit
    interface ethernet e1
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e2
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e3
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e4
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e5
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e6
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e7
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e8
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e9
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e10
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e11
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e12
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e13
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e14
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e15
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e16
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e17
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e18
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e19
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e20
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e21
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e22
    lldp med enable network-policy poe-pse
    exit
    lldp med network-policy 1 voice vlan 111 vlan-type tagged
    interface range ethernet e(1-22)
    lldp med network-policy add 1
    exit
    interface vlan 199
    ip address 199.16.30.77 255.255.255.0
    exit
    ip default-gateway 199.16.30.3
    interface vlan 1
    no ip address dhcp
    exit
    no bonjour enable
    bonjour service enable csco-sb
    bonjour service enable http  
    bonjour service enable https 
    bonjour service enable ssh   
    bonjour service enable telnet
    hostname psw1
    line console
    exec-timeout 30
    exit
    line ssh
    exec-timeout 30
    exit
    line telnet
    exec-timeout 30
    exit
    management access-list Management1
    permit ip-source 10.22.5.5 mask 255.255.255.0
    exit
    logging 199.16.31.33 severity debugging description mysysloghost
    aaa authentication enable Console local
    aaa authentication enable SSH tacacs local
    aaa authentication enable Telnet local
    ip http authentication tacacs local
    ip https authentication tacacs local
    aaa authentication login Console local
    aaa authentication login SSH tacacs local
    aaa authentication login Telnet local
    line telnet
    login authentication Telnet
    enable authentication Telnet
    password admin
    exit
    line ssh
    login authentication SSH
    enable authentication SSH
    password admin
    exit
    line console
    login authentication Console
    enable authentication Console
    password admin
    exit
    username admin password admin level 15
    power inline usage-threshold 90
    power inline traps enable
    ip ssh server
    snmp-server location in-the-closet
    snmp-server contact [email protected]
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    ip https server
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    clock timezone -7
    clock source sntp
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    sntp unicast client poll
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    sntp server 199.16.30.2
    ip domain-name mydomain.com
    ip name-server  199.16.5.12 199.16.5.13
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    Disclaimer
    The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
    Liability Disclaimer
    In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
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