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Lower costs, fast roll-out and proven technical know-how have won
mobile value-added services developer Telsis a significant
foothold at UK mobile operator BT Cellnet.

In an order placed through BT Wholesale, BT Cellnet has rolled out
Telsis' USSD pre-pay roaming solution - enabling pre-pay customers
to use their phones overseas, and generating immediate revenue,
without waiting for new global roaming standard CAMEL to be
ratified and widely adopted.

"We made our decision after becoming convinced by Telsis'
experience in this field and the speed with which they could
respond." said Steve Wright of BT Cellnet.

"In a sense this is not just an interim solution. Of course we
will implement CAMEL at some point in the future, but there will
still be a need to support our customers in countries where the
new standard has not been adopted, and that means USSD-enabled
roaming. The fundamental flexibility of the Telsis solution
creates additional future proofing because roaming is just one of
many value-added services that it supports."

USSD-enabled pre-pay roaming requires the handset user to enter a
special USSD string -*111* before dialling the number they wish
to reach, followed by the # key. The host network transfers the
USSD request to the home network where a switch simultaneously
places two calls, one back to the roaming handset, the other to
the number the customer dialled. The switch then connects both
parties.

The service benefits from a unique feature of the Telsis Ocean
fastSSP programmable switch - the ability to detect a lack of
audio activity on both legs of the call. This ensures that
connections are cleared down promptly even when there is a delay
in signalling from remote networks, and ensures that the network
infrastructure is utilised effectively.

In addition to the fastSSP, the Telsis pre-pay roaming solution
also includes the Ocean fastTC, a transaction converter which
receives and decodes USSD messages, translating them to a TCP/IP
protocol.

USSD-enabled pre-pay roaming has a number of key advantages. USSD
signalling is generic to GSM networks, so operators are not
reliant on each other to support pre-pay roaming. Connections are
initiated securely, completely under the control of the home
network. Monitoring of pre-pay credits used is also centralised.
Finally, the Telsis solution is fully enabled by a combination of
hardware and software in the host country only, and is proven to
integrate quickly with existing infrastructure for fast roll-out.

The Telsis family of products enables mobile operators to quickly
implement advanced network services for competitive advantage.
Telsis solutions are already widely in use with mobile operators
around the world.

With its headquarters, research and production site in the UK,
Telsis has sales and support operations in
Australia, France, Germany, Italy, The Netherlands, Singapore and
Spain. For more information visit http://www.telsis.com

-Ends-

Further editorial information:

Telsis Ltd: Adrian Swatridge +44 (0) 1489 885877
aswatridge@telsis.com

Sage Partnership:Kevin Fiske +44 (0) 1189 344007



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