Central- Site Deployment Design
Router links to remote sites via
WAN & PSTN
Video 8 - Network Foundation - Preparing the Infrastructure for VOIP:
Key roles of catalyst switches:
Provide power over Ethernet (POE)
Dual VLANs / Voice VLANs/ Aux VLANs
Class of service (COS) / Quality of service (QOS) – ability to prioritize vlan (voice traffic) over other traffic
How you can power a phone
Cisco Pre-Standard POE
Midspan Power – (power patch panel) – Sits in between switch and device and plugs into a power source
Benefit being that you do not have to replace switch with one that is POE
#Show Power Inline
Delay power shut off for
Phone that reboot when
They are plugged in.
# Power inline delay shutdown
Video 9 – Preparing the Infrastructure for VOIP, Part 2 –
Cisco IP Phone Boot Process
1. Cisco Switch detects PoE capabilities
2. Switch sends vlan via CDP
3. IP Phone receives DHCP request including option ISO
4. IP phone contacts TFTP server, receives configuration file.
5. IP phone registers with cme router.
Configuring DHCP services on router:
Exclude any necessary IP addresses
Create DHCP Pool
Define default router (gateway)
Define DNS settings
Configure IP Helper-Addresses, if necessary.
Show which devices have received IP via DHCP – Show IP DHCP binding