Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G Installation
Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G
After setting up the wireless network to support voice communications and configuring the wireless IP phones
in Cisco Unified Communications Manager, you are ready to install the phones. The following sections contain
The Cisco Unified Wireless IP Phone uses a battery for power. The following table lists the types of batteries
available for the wireless IP phone and the maximum talk and standby times.
Table 3: Batteries Available for the Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G
Use U-APSD for talk-time power save mode. Also 5 GHz talk time is reduced up to 30 minutes for a standard
battery and up to 2 hours for an extended battery. Use of 802.11b/g and a Bluetooth headset can reduce the
talk time by 40 to 50 percent. To extend talk-time battery life, the Cisco Unified Wireless IP Phone can use
PS-POLL power save methods. The Cisco Unified Wireless IP Phone uses either U-APSD or PS-POLL when
in idle (no active phone call).
When an AP supports the Cisco Compatible Extensions (CCX) proxy ARP information element, the idle
battery life is optimized. If the AP does not support CCX or proxy ARP is not enabled, then the idle battery
life is up to 50 percent less.
The following table shows the charging time for the two types of batteries. You can stop charging the battery
when the battery is fully charged. Lithium ion batteries can be partially charged without shortening the battery
life. Batteries should handle up to 4000 recharges.
Battery life varies because of environmental factors and Bluetooth use.
Table 4: Battery Charging Time
Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G Administration Guide
Lithium ion (Li-ion)
Up to 9.5 hrs
Up to 13 hrs
Power supply connected to phone
Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G Setup
Up to 180 hrs
Up to 240 hrs
Phone connected to PC and USB cable