control (RSVP). During times of network congestion, calling or called parties receive a Network Busy message.
The system maintains a small bandwidth reserve so that wireless phone clients can roam into a neighboring
AP, even when the AP is at full capacity. After the AP reaches the voice bandwidth limit, the next call is
load-balanced to a neighboring AP without affecting the quality of the existing calls on the channel.
Implementing QoS in the connected Ethernet switch is highly desirable to maintain good voice quality. The
COS and DSCP values that the Cisco Unified Wireless IP Phone sets do not need to be modified. To configure
QoS correctly on the AP, see Cisco Unified Wireless IP Phone 7925 and 7926 Series Deployment Guide.
Related Topics
Authentication Methods, on page 39
Cisco Unified Communications Manager Interactions, on page 37
Site Survey Verification, on page 44
Cisco Unified Communications Manager Interactions
Cisco Unified Communications Manager is the call control component in the network that handles and routes
calls for the wireless IP phones. Cisco Unified Communications Manager manages the components of the IP
telephony system—the phones, access gateways, and the resources—for such features as call conferencing
and route planning. When deploying the Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G,
you must use Cisco Unified Communications Manager Release 4.3 and later, and SCCP.
Before Cisco Unified Communications Manager can recognize a phone, the phone must register with Cisco
Unified Communications Manager and be configured in the database.
You can find more information about configuring Cisco Unified Communications Manager to work with the
IP phones and IP devices in the Cisco Unified Communications Manager Administration Guide and Cisco
Unified Communications Manager System Guide.
Related Topics
Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G Deployment, on page 19
Phone Configuration Files and Profile Files, on page 37
Phone Configuration Files and Profile Files
Phone configuration files define parameters for connecting to Cisco Unified Communications Manager and
are stored on the TFTP server. In general, any time you make a change in Cisco Unified Communications
Manager Administration that requires the phone to reset, the phone configuration file changes automatically.
Configuration files also contain information about the correct image load for the phone. If this image load
differs from the one currently loaded on a phone, the phone contacts the TFTP server to request the new image
file.
The phone first requests the configuration file SEPxxxxxxxxxxxx.cnf.xml, where each xx is the two-digit
lowercase hexadecimal representation of each integer in the MAC address. If the phone cannot find this file,
it requests the configuration file XMLDefault.cnf.xml.
After the phone obtains the *.cnf.xml files, it requests a phone-specific profile file. If a phone cannot find this
profile file, it requests the appropriate common profile file.
After the phone finds one of the profile files, or if it cannot find a profile file, it continues with its startup
process.
Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G Administration Guide
37
VoIP Wireless Network
Cisco Unified Communications Manager Interactions
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