Supported Networking Protocols; Chapter - Cisco 3905 Administration Manual

Cisco Unified IP Phone
Procedure
Step 1 Remove the handset from the cradle and pull the plastic tab from the handset rest.
Step 2 Rotate the tab 180 degrees.
Step 3 Hold the tab between two fingers, with the corner notches facing you.
Step 4
Line up the tab with the slot in the cradle and press the tab evenly into the slot. An extension protrudes from
the top of the rotated tab.
Step 5 Return the handset to the handset rest.

Supported Networking Protocols

Cisco Unified IP Phones support several industry-standard and Cisco networking protocols required for voice
communication. The following table provides an overview of the networking protocols that the Cisco Unified
SIP Phone 3905 support.
Table 1: Supported Networking Protocols on the Cisco Unified IP Phone
Networking Protocol
Cisco Discovery
Protocol (CDP)
Dynamic Host
Configuration Protocol
(DHCP)
Purpose
CDP is a device-discovery protocol
that runs on all Cisco-manufactured
equipment.
Using CDP, a device can advertise
its existence to other devices and
receive information about other
devices in the network.
DHCP dynamically allocates and
assigns an IP address to network
devices.
DHCP enables you to connect an IP
phone into the network and have the
phone become operational without
your needing to manually assign an
IP address or to configure additional
network parameters.
Cisco Unified SIP Phone 3905 Administration Guide for Cisco Unified Communications Manager 8.6 (SIP)
Supported Networking Protocols
Usage Notes
The Cisco Unified IP Phone uses CDP to
communicate information such as auxiliary
VLAN ID, per port power management
details, and Quality of Service (QoS)
configuration information with the Cisco
Catalyst switch.
DHCP is enabled by default. If disabled, you
must manually configure the IP address,
subnet mask, gateway, and a TFTP server on
each phone locally.
Cisco recommends that you use DHCP
custom option 150. With this method, you
configure the TFTP server IP address as the
option value. For additional supported DHCP
configurations, go to the "Dynamic Host
Configuration Protocol" chapter and the
"Cisco TFTP" chapter in the Cisco Unified
Communications Manager System Guide.
Note If you cannot use option 150, you
may try using DHCP option 66.
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