Unified Communications Introduction

Before Converged Networks

• Telephone networks were separate from data networks
• Handsets, PBX, and wiring
• IP Telephony allowed a single wire to be run to each user location

Single Wire \ Multiple VLANs

• 1 network drop per suer
  • Brings installation cost provably to over a half
• Power over Ethernet
  • Electrical cabling is pricy, so power over ethernet is very convenient
• Voice VLAN
  • PC -> NOT TAG -> Phone -> TAG -> Switch
• Priority Tags
• Data VLAN

Required Details

• PoE, PoE+, UPoE etc

• Voice VLAN

• Phone Server IP

• QoS Policy

• A lot of this happens inside your DHCP scope

• DHCP Relay

  • Shouting as a broadcast
  • A hearing router translates your broadcast into unicast

• Who is responsible for this forwarding operation