T-Mobile Wi-Fi Calling for Government
Great
coverage,
unlimited
calling.
Save with Wi-Fi
Calling for Government
Network Diagram
Cellular Radio Access Network (RAN)
Whether you are a large or medium-size agency, T-Mobile
Wi-Fi Calling for Government can help you cut wireless
costs and provide coverage in areas no provider serves.*
• Reduces wireless mobility costs
• Reduces international roaming costs
• Coverage in areas no provider serves
• FIPS compliant and secure Wi-Fi calling
W H AT I S U M A ?
UMA is an IP extension of the T-Mobile GSM/GPRS network.
It uses the Internet as a transport medium for voice calls and,
with little modification, uses all of the GSM/GPRS protocols
above the radio layer.
The UMA subscriber’s authentication is based on the SIM but
does not replace the normal GSM authentication and security
between the phone and the MSC. The keys resulting from
the phone-to-MSC authentication exchange are also used in
a UMA-specific challenge-response handshake between the
phone and the UNC. The UNC itself includes a security gateway,
which plays a number of key roles in the UMA architecture. The
UNC security gateway authenticates the mobile user based
on hard-coded information on the device (e.g., the subscriber
profile, location, and activity status information stored in the
Home Location Register). Once the handset/AP connection
is established, the device will be assigned an IP address
which in turn establishes the IPSec tunnel to the UNC (this is
accomplished by IKEv2 protocols). No other operator’s UMA
service can be used on our devices.
Private
Network
UMA-Enabled
Dual-mode
Handset
Base Transceiver
Stations (BTS)
Unlicensed Wireless
Network (Wi-Fi,
Bluetooth,® etc.)
Base Station
Controller (BSC)
Core Mobile
Network
UMA Network
Controller (UNC)
IP Access
Network
Unlicensed Mobile Access Network (UMAN)
network remains unmodified and the UMA Network Controller (UNC) is introduced. The UNC acts
as a gateway between the mobile operator core network and Internet or broadband IP access.
For more information, contact your T-Mobile government representative.
* Broadband connection required.
Plus taxes and fees. Limited-time offer; subject to change. Unlimited HotSpot Calling Service: HotSpot-enabled phone, wireless router, broadband Internet connection, qualifying voice rate plan, and Unlimited HotSpot Calling add-on plan
required for unlimited Wi-Fi calling feature. With add-on plan, rate plan minutes used for calls not originating on Wi-Fi network. See brochures, and T-Mobile’s Terms and Conditions (including arbitration provision) at www.T-Mobile.com,
for additional rate plan information, charges for features/services, restrictions and details, including important limitations on availability and reliability of 9-1-1 emergency service. The RIM and BlackBerry families of related marks,
images and related symbols are the exclusive property of and trademarks of Research In Motion Limited — used by permission. T-Mobile and the magenta color are registered trademarks of Deutsche Telekom AG. The myFaves design and
stick together are registered trademarks of T-Mobile USA, Inc. © 2009 T-Mobile USA, Inc.
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