3Com Switch 4500 26-Port User Manual

66 CHAPTER 3: VLAN OPERATION
■ Be sure that the OUI of the phone is included in the OUI table. This will
certainly be the case by default for 3Com NBX phones but should be checked
for non-3Com phones
■ If a PWR unit is being used to power the VoIP phone, you must enable PoE on
the required ports
■ If Cisco phones are used that are not IEEE 802.3af PoE compliant, but they
support pre-standard PoE signaling, you may need to enable the legacy PoE
feature
■ Ensure phones are not pre-configured with a static IP address
■ If used in a 3Com NBX network, be sure NBX Call processor is set to "Standard
IP." Likewise, ensure the NBX Call Processor default Gateway is set to the
VLAN interface IP address. Note that any IP related configuration changes to
the NBX Call processor will require a reboot to take affect.
Figure 18 VoIP Sample Configuration with 3Com NBX
Step By Step Description
1 The DHCP Server (IP address is 10.10.11.205/24) connected to Port 2 of the switch
(Switch 4500-PWR) has three scopes:
■ 10.10.11.0 (Address pool:10.10.11.211-250) for Data Vlan 1
■ 10.10.12.0 (Address pool: 10.10.12.100-130) for Data Vlan 5
■ 50.1.1.0 for Voice Vlan 50.
This server needs to have Option 184 configured. Figure 19 displays the DHCP
scopes.

3Com Switch 4500 26-Port Specifications

General

Brand	3Com
Model	Switch 4500 26-Port
Category	Switch
Language	English