Secure the switch’s ports Best Practices VoIP-SIP Security

The separation established with solutions S.03 and S.04 may be compromised if an
attacker can connect a machine to a switch port. To avoid this, you should apply the
following solutions (all if possible):
     -   Deactivate or place in an unused VLAN the ports that are unused
     -   A ACL should be set to authorise only known MAC addresses (per port if 
        possible)
     -   802.1x authentication should be used if the switch and the IP phones support it
      
Read More:http://www.vadese.org/files/upload/Best_practices_VoIP_en_v20.pdf

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