Cisco 7925G Administration Guide

Related Topics
Phone Startup Process, on page 64
Dynamic Host Configuration Protocol Server Interactions
Dynamic Host Configuration Protocol (DHCP) is a communications protocol that lets network administrators
manage and automate the assignment of IP addresses in a network. When an IP device is added to the network,
it must have a unique IP address. Without DHCP, the IP address must be entered manually at each device.
DHCP allocates IP addresses dynamically and reuses IP addresses when devices no longer need them.
If DHCP is enabled in the network, the Cisco Unified Wireless IP Phone uses the DHCP scope settings in the
DHCP server to perform the phone provisioning bootup process. You must configure the settings of the DHCP
server in the Cisco Unified Communications Manager network.
The DHCP scope settings include the following:
•
TFTP servers
•
DNS server IP address (optional unless using host names)
•
Pool and range of the subnet mask, IP address, and gateway
The priority of the DHCP settings for the TFTP server is unique to the Cisco Unified Wireless IP Phone, as
shown in the following table.
Table 10: DHCP Settings Priority
DHCPsettingsPriority
DHCP option 1501
DHCP option 662
SIADDR3
ciscoCM14
If DHCP is disabled, the Cisco Unified Wireless IP Phone uses the network settings in the following table to
perform the phone provisioning bootup process. You must configure these static parameters for each Cisco
Unified Wireless IP Phone.
Table 11: Static IP Addresses when DHCP is Disabled
DescriptionStatic Setting
IP address, the unique identifier assigned by the system administrator for the
phone.
IP Address
Used to partition the IP address into a network identifier and host identifier
so that TCP/IP can distinguish between them.
Subnet Mask
Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G Administration Guide
38
VoIP Wireless Network
Dynamic Host Configuration Protocol Server Interactions

Cisco 7925G Specifications

General

Keypad number of keys	12
Display diagonal	2 \
Display resolution	176 x 220 pixels
Call waiting	Yes
Lines quantity	6 lines
Voice codecs	G.711a, G.722, G.729a, iLBC
Security algorithms	128-bit WEP, SSL/TLS, WPA
Supported network protocols	DHCP, TFTP, DNS, SCCP, SRST
Input voltage	100 - 240 V
Dimensions (WxDxH)	52 x 20 x 127 mm
Minimum system requirements	Cisco Unified Communications Manager 4.1, 4.2, 4.3, 5.1, 6.0, 6.1, 7.0 + Cisco Unified Communications Manager Express 4.3 +
Input frequency	50/60 Hz
Storage temperature (T-T)	-30 - 60 °C
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Product type	IP Phone
Product color	Gray
Safety	UL 60950, CSA 22.2 No.60950, EN 60950, IEC 60950, AS/NZS 60950, IEC 60529 (IP 54)
Certification	47 CFR 15 B ICES-003 B EN 55022 B AS/NZS CISPR 22 B CISPR 22 B VCCI B EN 61000-3-2 EN 61000-3-3 KN 22 EN 55024 EN 50082-1 EN 61000-6-1 EN 300386 EN 60601-1-2 KN
Compliance industry standards	IEEE 802.11a, IEEE 802.11b, IEEE 802.11g, IEEE 802.1X, IEEE 802.11e

Weight and Dimensions

Weight	138 g