Writing about it :)
here is a quick look
CNTBlog :: The Collaboration Networking Tutorial Blog :: CCIE, CCIE Lab, Certification, Cisco, Cisco Certification, Internetwork Expert Volume IV, Troubleshooting , LAN, VLAN , Voice, Video, SIP, H323, MGCP, SCCP, 802.1Q, CCNP Voice, Collaboration, IOS, Dial-peer, VCS, CUCM, CIMP, CUC, WebEX, Uniy, Presence, UCS, Vmware
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